diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index f965fc0..dd7c926 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -61,5 +61,4 @@ jobs:
       env:
         CGO_LDFLAGS: ${{ matrix.config.cgo_ldflags }}
       run: |
-        cd go4k
         go test . ./bridge
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5f3a377..f67568e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -42,8 +42,8 @@ endif()
 
 # the tests include the entire ASM but we still want to rebuild when they change
 file(GLOB templates ${PROJECT_SOURCE_DIR}/templates/*.asm)
-file(GLOB go4k "${PROJECT_SOURCE_DIR}/go4k/*.go" "${PROJECT_SOURCE_DIR}/go4k/cmd/sointu-cli/*.go")
-file(GLOB compilersrc "${PROJECT_SOURCE_DIR}/go4k/compiler/*.go")
+file(GLOB go4k "${PROJECT_SOURCE_DIR}/*.go" "${PROJECT_SOURCE_DIR}/cmd/sointu-cli/*.go")
+file(GLOB compilersrc "${PROJECT_SOURCE_DIR}/compiler/*.go")
 
 if(DEFINED CMAKE_C_SIZEOF_DATA_PTR AND CMAKE_C_SIZEOF_DATA_PTR EQUAL 8)
     set(arch "amd64")
@@ -59,7 +59,7 @@ set(sointuasm sointu.asm)
 
 add_custom_command(            
     OUTPUT ${sointuasm}
-    COMMAND go run ${PROJECT_SOURCE_DIR}/go4k/compiler/generate.go -arch=${arch} ${CMAKE_CURRENT_BINARY_DIR}
+    COMMAND go run ${PROJECT_SOURCE_DIR}/compiler/generate.go -arch=${arch} ${CMAKE_CURRENT_BINARY_DIR}
     DEPENDS "${templates}" "${go4k}" "${compilersrc}"
 )
 
diff --git a/go4k/audio/convertbuffer.go b/audio/convertbuffer.go
similarity index 100%
rename from go4k/audio/convertbuffer.go
rename to audio/convertbuffer.go
diff --git a/go4k/audio/convertbuffer_test.go b/audio/convertbuffer_test.go
similarity index 100%
rename from go4k/audio/convertbuffer_test.go
rename to audio/convertbuffer_test.go
diff --git a/go4k/audio/oto/otoplayer.go b/audio/oto/otoplayer.go
similarity index 96%
rename from go4k/audio/oto/otoplayer.go
rename to audio/oto/otoplayer.go
index 577ff0a..ac9997b 100644
--- a/go4k/audio/oto/otoplayer.go
+++ b/audio/oto/otoplayer.go
@@ -3,7 +3,7 @@ package oto
 import (
 	"fmt"
 	"github.com/hajimehoshi/oto"
-	"github.com/vsariola/sointu/go4k/audio"
+	"github.com/vsariola/sointu/audio"
 )
 
 // OtoPlayer wraps github.com/hajimehoshi/oto to play sointu-style float32[] audio
diff --git a/go4k/audio/player.go b/audio/player.go
similarity index 100%
rename from go4k/audio/player.go
rename to audio/player.go
diff --git a/go4k/bridge/asmformat_test.go b/bridge/asmformat_test.go
similarity index 92%
rename from go4k/bridge/asmformat_test.go
rename to bridge/asmformat_test.go
index fba232e..cc84f4e 100644
--- a/go4k/bridge/asmformat_test.go
+++ b/bridge/asmformat_test.go
@@ -13,14 +13,14 @@ import (
 	"strings"
 	"testing"
 
-	"github.com/vsariola/sointu/go4k"
-	"github.com/vsariola/sointu/go4k/bridge"
+	"github.com/vsariola/sointu"
+	"github.com/vsariola/sointu/bridge"
 	"gopkg.in/yaml.v2"
 )
 
 func TestAllAsmFiles(t *testing.T) {
 	_, myname, _, _ := runtime.Caller(0)
-	files, err := filepath.Glob(path.Join(path.Dir(myname), "..", "..", "tests", "*.yml"))
+	files, err := filepath.Glob(path.Join(path.Dir(myname), "..", "tests", "*.yml"))
 	if err != nil {
 		t.Fatalf("cannot glob files in the test directory: %v", err)
 	}
@@ -36,7 +36,7 @@ func TestAllAsmFiles(t *testing.T) {
 			if err != nil {
 				t.Fatalf("cannot read the .asm file: %v", filename)
 			}
-			var song go4k.Song
+			var song sointu.Song
 			err = yaml.Unmarshal(asmcode, &song)
 			if err != nil {
 				t.Fatalf("could not parse the .yml file: %v", err)
@@ -45,12 +45,12 @@ func TestAllAsmFiles(t *testing.T) {
 			if err != nil {
 				t.Fatalf("Compiling patch failed: %v", err)
 			}
-			buffer, err := go4k.Play(synth, song)
+			buffer, err := sointu.Play(synth, song)
 			buffer = buffer[:song.TotalRows()*song.SamplesPerRow()*2] // extend to the nominal length always.
 			if err != nil {
 				t.Fatalf("Play failed: %v", err)
 			}
-			if os.Getenv("GO4K_TEST_SAVE_OUTPUT") == "YES" {
+			if os.Getenv("SOINTU_TEST_SAVE_OUTPUT") == "YES" {
 				outputpath := path.Join(path.Dir(myname), "actual_output")
 				if _, err := os.Stat(outputpath); os.IsNotExist(err) {
 					os.Mkdir(outputpath, 0755)
@@ -83,7 +83,7 @@ func TestAllAsmFiles(t *testing.T) {
 
 func compareToRawFloat32(t *testing.T, buffer []float32, rawname string) {
 	_, filename, _, _ := runtime.Caller(0)
-	expectedb, err := ioutil.ReadFile(path.Join(path.Dir(filename), "..", "..", "tests", "expected_output", rawname))
+	expectedb, err := ioutil.ReadFile(path.Join(path.Dir(filename), "..", "tests", "expected_output", rawname))
 	if err != nil {
 		t.Fatalf("cannot read expected: %v", err)
 	}
@@ -105,7 +105,7 @@ func compareToRawFloat32(t *testing.T, buffer []float32, rawname string) {
 
 func compareToRawInt16(t *testing.T, buffer []int16, rawname string) {
 	_, filename, _, _ := runtime.Caller(0)
-	expectedb, err := ioutil.ReadFile(path.Join(path.Dir(filename), "..", "..", "tests", "expected_output", rawname))
+	expectedb, err := ioutil.ReadFile(path.Join(path.Dir(filename), "..", "tests", "expected_output", rawname))
 	if err != nil {
 		t.Fatalf("cannot read expected: %v", err)
 	}
diff --git a/go4k/bridge/bridge.go b/bridge/bridge.go
similarity index 90%
rename from go4k/bridge/bridge.go
rename to bridge/bridge.go
index 8ef658e..81e4355 100644
--- a/go4k/bridge/bridge.go
+++ b/bridge/bridge.go
@@ -1,7 +1,7 @@
 package bridge
 
-// #cgo CFLAGS: -I"${SRCDIR}/../../build/"
-// #cgo LDFLAGS: "${SRCDIR}/../../build/libsointu.a"
+// #cgo CFLAGS: -I"${SRCDIR}/../build/"
+// #cgo LDFLAGS: "${SRCDIR}/../build/libsointu.a"
 // #include <sointu.h>
 import "C"
 import (
@@ -9,11 +9,11 @@ import (
 	"fmt"
 	"strings"
 
-	"github.com/vsariola/sointu/go4k"
-	"github.com/vsariola/sointu/go4k/compiler"
+	"github.com/vsariola/sointu"
+	"github.com/vsariola/sointu/compiler"
 )
 
-func Synth(patch go4k.Patch) (*C.Synth, error) {
+func Synth(patch sointu.Patch) (*C.Synth, error) {
 	s := new(C.Synth)
 	comPatch, err := compiler.Encode(&patch, compiler.AllFeatures{})
 	if err != nil {
@@ -75,13 +75,13 @@ func (synth *C.Synth) Render(buffer []float32, maxtime int) (int, int, error) {
 	return int(samples), int(time), nil
 }
 
-// Trigger is part of C.Synths' implementation of go4k.Synth interface
+// Trigger is part of C.Synths' implementation of sointu.Synth interface
 func (s *C.Synth) Trigger(voice int, note byte) {
 	s.SynthWrk.Voices[voice] = C.Voice{}
 	s.SynthWrk.Voices[voice].Note = C.int(note)
 }
 
-// Release is part of C.Synths' implementation of go4k.Synth interface
+// Release is part of C.Synths' implementation of sointu.Synth interface
 func (s *C.Synth) Release(voice int) {
 	s.SynthWrk.Voices[voice].Release = 1
 }
diff --git a/bridge/bridge_test.go b/bridge/bridge_test.go
new file mode 100644
index 0000000..2a027c2
--- /dev/null
+++ b/bridge/bridge_test.go
@@ -0,0 +1,146 @@
+package bridge_test
+
+import (
+	"bytes"
+	"encoding/binary"
+	"io/ioutil"
+	"path"
+	"runtime"
+	"testing"
+
+	"github.com/vsariola/sointu"
+	"github.com/vsariola/sointu/bridge"
+)
+
+func TestBridge(t *testing.T) {
+	patch := sointu.Patch{
+		Instruments: []sointu.Instrument{
+			sointu.Instrument{1, []sointu.Unit{
+				sointu.Unit{Type: "envelope", Parameters: map[string]int{"stereo": 0, "attack": 64, "decay": 64, "sustain": 64, "release": 80, "gain": 128}},
+				sointu.Unit{Type: "envelope", Parameters: map[string]int{"stereo": 0, "attack": 95, "decay": 64, "sustain": 64, "release": 80, "gain": 128}},
+				sointu.Unit{Type: "out", Parameters: map[string]int{"stereo": 1, "gain": 128}},
+			}}}}
+
+	synth, err := bridge.Synth(patch)
+	if err != nil {
+		t.Fatalf("bridge compile error: %v", err)
+	}
+	synth.Trigger(0, 64)
+	buffer := make([]float32, 2*su_max_samples)
+	err = sointu.Render(synth, buffer[:len(buffer)/2])
+	if err != nil {
+		t.Fatalf("first render gave an error")
+	}
+	synth.Release(0)
+	err = sointu.Render(synth, buffer[len(buffer)/2:])
+	if err != nil {
+		t.Fatalf("first render gave an error")
+	}
+	_, filename, _, _ := runtime.Caller(0)
+	expectedb, err := ioutil.ReadFile(path.Join(path.Dir(filename), "..", "tests", "expected_output", "test_render_samples.raw"))
+	if err != nil {
+		t.Fatalf("cannot read expected: %v", err)
+	}
+	var createdbuf bytes.Buffer
+	err = binary.Write(&createdbuf, binary.LittleEndian, buffer)
+	if err != nil {
+		t.Fatalf("error converting buffer: %v", err)
+	}
+	createdb := createdbuf.Bytes()
+	if len(createdb) != len(expectedb) {
+		t.Fatalf("buffer length mismatch, got %v, expected %v", len(createdb), len(expectedb))
+	}
+	for i, v := range createdb {
+		if expectedb[i] != v {
+			t.Errorf("byte mismatch @ %v, got %v, expected %v", i, v, expectedb[i])
+			break
+		}
+	}
+}
+
+func TestStackUnderflow(t *testing.T) {
+	patch := sointu.Patch{
+		Instruments: []sointu.Instrument{
+			sointu.Instrument{1, []sointu.Unit{
+				sointu.Unit{Type: "pop", Parameters: map[string]int{}},
+			}}}}
+	synth, err := bridge.Synth(patch)
+	if err != nil {
+		t.Fatalf("bridge compile error: %v", err)
+	}
+	buffer := make([]float32, 2)
+	err = sointu.Render(synth, buffer)
+	if err == nil {
+		t.Fatalf("rendering should have failed due to stack underflow")
+	}
+}
+
+func TestStackBalancing(t *testing.T) {
+	patch := sointu.Patch{
+		Instruments: []sointu.Instrument{
+			sointu.Instrument{1, []sointu.Unit{
+				sointu.Unit{Type: "push", Parameters: map[string]int{}},
+			}}}}
+	synth, err := bridge.Synth(patch)
+	if err != nil {
+		t.Fatalf("bridge compile error: %v", err)
+	}
+	buffer := make([]float32, 2)
+	err = sointu.Render(synth, buffer)
+	if err == nil {
+		t.Fatalf("rendering should have failed due to unbalanced stack push/pop")
+	}
+}
+
+func TestStackOverflow(t *testing.T) {
+	patch := sointu.Patch{
+		Instruments: []sointu.Instrument{
+			sointu.Instrument{1, []sointu.Unit{
+				sointu.Unit{Type: "loadval", Parameters: map[string]int{"value": 128}},
+				sointu.Unit{Type: "loadval", Parameters: map[string]int{"value": 128}},
+				sointu.Unit{Type: "loadval", Parameters: map[string]int{"value": 128}},
+				sointu.Unit{Type: "loadval", Parameters: map[string]int{"value": 128}},
+				sointu.Unit{Type: "loadval", Parameters: map[string]int{"value": 128}},
+				sointu.Unit{Type: "loadval", Parameters: map[string]int{"value": 128}},
+				sointu.Unit{Type: "loadval", Parameters: map[string]int{"value": 128}},
+				sointu.Unit{Type: "loadval", Parameters: map[string]int{"value": 128}},
+				sointu.Unit{Type: "loadval", Parameters: map[string]int{"value": 128}},
+				sointu.Unit{Type: "pop", Parameters: map[string]int{}},
+				sointu.Unit{Type: "pop", Parameters: map[string]int{}},
+				sointu.Unit{Type: "pop", Parameters: map[string]int{}},
+				sointu.Unit{Type: "pop", Parameters: map[string]int{}},
+				sointu.Unit{Type: "pop", Parameters: map[string]int{}},
+				sointu.Unit{Type: "pop", Parameters: map[string]int{}},
+				sointu.Unit{Type: "pop", Parameters: map[string]int{}},
+				sointu.Unit{Type: "pop", Parameters: map[string]int{}},
+				sointu.Unit{Type: "pop", Parameters: map[string]int{}},
+			}}}}
+	synth, err := bridge.Synth(patch)
+	if err != nil {
+		t.Fatalf("bridge compile error: %v", err)
+	}
+	buffer := make([]float32, 2)
+	err = sointu.Render(synth, buffer)
+	if err == nil {
+		t.Fatalf("rendering should have failed due to stack overflow, despite balanced push/pops")
+	}
+}
+
+func TestDivideByZero(t *testing.T) {
+	patch := sointu.Patch{
+		Instruments: []sointu.Instrument{
+			sointu.Instrument{1, []sointu.Unit{
+				sointu.Unit{Type: "loadval", Parameters: map[string]int{"value": 128}},
+				sointu.Unit{Type: "invgain", Parameters: map[string]int{"invgain": 0}},
+				sointu.Unit{Type: "pop", Parameters: map[string]int{}},
+			}}}}
+	synth, err := bridge.Synth(patch)
+	if err != nil {
+		t.Fatalf("bridge compile error: %v", err)
+	}
+	buffer := make([]float32, 2)
+	err = sointu.Render(synth, buffer)
+	if err == nil {
+		t.Fatalf("rendering should have failed due to divide by zero")
+	}
+}
diff --git a/go4k/bridge/init_windows.go b/bridge/init_windows.go
similarity index 100%
rename from go4k/bridge/init_windows.go
rename to bridge/init_windows.go
diff --git a/bridge/song_test.go b/bridge/song_test.go
new file mode 100644
index 0000000..630edee
--- /dev/null
+++ b/bridge/song_test.go
@@ -0,0 +1,66 @@
+package bridge_test
+
+import (
+	"bytes"
+	"encoding/binary"
+	"io/ioutil"
+	"path"
+	"runtime"
+	"testing"
+
+	"github.com/vsariola/sointu"
+	"github.com/vsariola/sointu/bridge"
+	// TODO: test the song using a mocks instead
+)
+
+const BPM = 100
+const SAMPLE_RATE = 44100
+const TOTAL_ROWS = 16
+const SAMPLES_PER_ROW = SAMPLE_RATE * 4 * 60 / (BPM * 16)
+
+const su_max_samples = SAMPLES_PER_ROW * TOTAL_ROWS
+
+// const bufsize = su_max_samples * 2
+
+func TestPlayer(t *testing.T) {
+	patch := sointu.Patch{
+		Instruments: []sointu.Instrument{sointu.Instrument{1, []sointu.Unit{
+			sointu.Unit{Type: "envelope", Parameters: map[string]int{"stereo": 0, "attack": 32, "decay": 32, "sustain": 64, "release": 64, "gain": 128}},
+			sointu.Unit{Type: "oscillator", Parameters: map[string]int{"stereo": 0, "transpose": 64, "detune": 64, "phase": 0, "color": 96, "shape": 64, "gain": 128, "type": sointu.Sine, "lfo": 0, "unison": 0}},
+			sointu.Unit{Type: "mulp", Parameters: map[string]int{"stereo": 0}},
+			sointu.Unit{Type: "envelope", Parameters: map[string]int{"stereo": 0, "attack": 32, "decay": 32, "sustain": 64, "release": 64, "gain": 128}},
+			sointu.Unit{Type: "oscillator", Parameters: map[string]int{"stereo": 0, "transpose": 72, "detune": 64, "phase": 64, "color": 64, "shape": 96, "gain": 128, "type": sointu.Sine, "lfo": 0, "unison": 0}},
+			sointu.Unit{Type: "mulp", Parameters: map[string]int{"stereo": 0}},
+			sointu.Unit{Type: "out", Parameters: map[string]int{"stereo": 1, "gain": 128}},
+		}}}}
+	patterns := [][]byte{{64, 0, 68, 0, 32, 0, 0, 0, 75, 0, 78, 0, 0, 0, 0, 0}}
+	tracks := []sointu.Track{sointu.Track{1, []byte{0}}}
+	song := sointu.Song{BPM: 100, Patterns: patterns, Tracks: tracks, Patch: patch, Output16Bit: false, Hold: 1}
+	synth, err := bridge.Synth(patch)
+	if err != nil {
+		t.Fatalf("Compiling patch failed: %v", err)
+	}
+	buffer, err := sointu.Play(synth, song)
+	if err != nil {
+		t.Fatalf("Render failed: %v", err)
+	}
+	_, filename, _, _ := runtime.Caller(0)
+	expectedb, err := ioutil.ReadFile(path.Join(path.Dir(filename), "..", "tests", "expected_output", "test_oscillat_sine.raw"))
+	if err != nil {
+		t.Fatalf("cannot read expected: %v", err)
+	}
+	var createdbuf bytes.Buffer
+	err = binary.Write(&createdbuf, binary.LittleEndian, buffer)
+	if err != nil {
+		t.Fatalf("error converting buffer: %v", err)
+	}
+	createdb := createdbuf.Bytes()
+	if len(createdb) != len(expectedb) {
+		t.Fatalf("buffer length mismatch, got %v, expected %v", len(createdb), len(expectedb))
+	}
+	for i, v := range createdb {
+		if expectedb[i] != v {
+			t.Fatalf("byte mismatch @ %v, got %v, expected %v", i, v, expectedb[i])
+		}
+	}
+}
diff --git a/go4k/cmd/sointu-cli/main.go b/cmd/sointu-cli/main.go
similarity index 95%
rename from go4k/cmd/sointu-cli/main.go
rename to cmd/sointu-cli/main.go
index 9a5b35b..495c19d 100644
--- a/go4k/cmd/sointu-cli/main.go
+++ b/cmd/sointu-cli/main.go
@@ -14,10 +14,10 @@ import (
 
 	"gopkg.in/yaml.v3"
 
-	"github.com/vsariola/sointu/go4k"
-	"github.com/vsariola/sointu/go4k/audio/oto"
-	"github.com/vsariola/sointu/go4k/bridge"
-	"github.com/vsariola/sointu/go4k/compiler"
+	"github.com/vsariola/sointu"
+	"github.com/vsariola/sointu/audio/oto"
+	"github.com/vsariola/sointu/bridge"
+	"github.com/vsariola/sointu/compiler"
 )
 
 func main() {
@@ -94,7 +94,7 @@ func main() {
 		if err != nil {
 			return fmt.Errorf("Could not read file %v: %v", filename, err)
 		}
-		var song go4k.Song
+		var song sointu.Song
 		if errJSON := json.Unmarshal(inputBytes, &song); errJSON != nil {
 			if errYaml := yaml.Unmarshal(inputBytes, &song); errYaml != nil {
 				return fmt.Errorf("The song could not be parsed as .json (%v) or .yml (%v)", errJSON, errYaml)
@@ -106,9 +106,9 @@ func main() {
 			if err != nil {
 				return fmt.Errorf("Could not create synth based on the patch: %v", err)
 			}
-			buffer, err = go4k.Play(synth, song) // render the song to calculate its length
+			buffer, err = sointu.Play(synth, song) // render the song to calculate its length
 			if err != nil {
-				return fmt.Errorf("go4k.Play failed: %v", err)
+				return fmt.Errorf("sointu.Play failed: %v", err)
 			}
 		}
 		if *play {
diff --git a/go4k/cmd/sointu-tracker/main.go b/cmd/sointu-tracker/main.go
similarity index 83%
rename from go4k/cmd/sointu-tracker/main.go
rename to cmd/sointu-tracker/main.go
index fe6c843..485e7bd 100644
--- a/go4k/cmd/sointu-tracker/main.go
+++ b/cmd/sointu-tracker/main.go
@@ -4,8 +4,8 @@ import (
 	"fmt"
 	"gioui.org/app"
 	"gioui.org/unit"
-	"github.com/vsariola/sointu/go4k/audio/oto"
-	"github.com/vsariola/sointu/go4k/tracker"
+	"github.com/vsariola/sointu/audio/oto"
+	"github.com/vsariola/sointu/tracker"
 	"os"
 )
 
diff --git a/go4k/compiler/compiler.go b/compiler/compiler.go
similarity index 92%
rename from go4k/compiler/compiler.go
rename to compiler/compiler.go
index ba53b83..2ecc701 100644
--- a/go4k/compiler/compiler.go
+++ b/compiler/compiler.go
@@ -9,7 +9,7 @@ import (
 	"text/template"
 
 	"github.com/Masterminds/sprig"
-	"github.com/vsariola/sointu/go4k"
+	"github.com/vsariola/sointu"
 )
 
 //go:generate go run generate.go
@@ -24,7 +24,7 @@ type Compiler struct {
 // New returns a new compiler using the default .asm templates
 func New() (*Compiler, error) {
 	_, myname, _, _ := runtime.Caller(0)
-	templateDir := filepath.Join(path.Dir(myname), "..", "..", "templates")
+	templateDir := filepath.Join(path.Dir(myname), "..", "templates")
 	compiler, err := NewFromTemplates(templateDir)
 	return compiler, err
 }
@@ -62,7 +62,7 @@ func (com *Compiler) Library() (map[string]string, error) {
 	return map[string]string{"asm": asmCode, "h": header}, nil
 }
 
-func (com *Compiler) Player(song *go4k.Song, maxSamples int) (map[string]string, error) {
+func (com *Compiler) Player(song *sointu.Song, maxSamples int) (map[string]string, error) {
 	features := NecessaryFeaturesFor(song.Patch)
 	encodedPatch, err := Encode(&song.Patch, features)
 	if err != nil {
diff --git a/go4k/compiler/encoded_patch.go b/compiler/encoded_patch.go
similarity index 92%
rename from go4k/compiler/encoded_patch.go
rename to compiler/encoded_patch.go
index 936c1fc..9920eea 100644
--- a/go4k/compiler/encoded_patch.go
+++ b/compiler/encoded_patch.go
@@ -4,7 +4,7 @@ import (
 	"errors"
 	"fmt"
 
-	"github.com/vsariola/sointu/go4k"
+	"github.com/vsariola/sointu"
 )
 
 type EncodedPatch struct {
@@ -22,7 +22,7 @@ type SampleOffset struct {
 	LoopLength uint16
 }
 
-func Encode(patch *go4k.Patch, featureSet FeatureSet) (*EncodedPatch, error) {
+func Encode(patch *sointu.Patch, featureSet FeatureSet) (*EncodedPatch, error) {
 	var c EncodedPatch
 	sampleOffsetMap := map[SampleOffset]int{}
 	for _, instr := range patch.Instruments {
@@ -75,13 +75,13 @@ func Encode(patch *go4k.Patch, featureSet FeatureSet) (*EncodedPatch, error) {
 	return &c, nil
 }
 
-func EncodeUnit(unit go4k.Unit, featureSet FeatureSet) (byte, []byte, error) {
+func EncodeUnit(unit sointu.Unit, featureSet FeatureSet) (byte, []byte, error) {
 	opcode, ok := featureSet.Opcode(unit.Type)
 	if !ok {
 		return 0, nil, fmt.Errorf(`the targeted virtual machine is not configured to support unit type "%v"`, unit.Type)
 	}
 	var values []byte
-	for _, v := range go4k.UnitTypes[unit.Type] {
+	for _, v := range sointu.UnitTypes[unit.Type] {
 		if v.CanModulate && v.CanSet {
 			values = append(values, byte(unit.Parameters[v.Name]))
 		}
@@ -93,15 +93,15 @@ func EncodeUnit(unit go4k.Unit, featureSet FeatureSet) (byte, []byte, error) {
 	} else if unit.Type == "oscillator" {
 		flags := 0
 		switch unit.Parameters["type"] {
-		case go4k.Sine:
+		case sointu.Sine:
 			flags = 0x40
-		case go4k.Trisaw:
+		case sointu.Trisaw:
 			flags = 0x20
-		case go4k.Pulse:
+		case sointu.Pulse:
 			flags = 0x10
-		case go4k.Gate:
+		case sointu.Gate:
 			flags = 0x04
-		case go4k.Sample:
+		case sointu.Sample:
 			flags = 0x80
 		}
 		if unit.Parameters["lfo"] == 1 {
diff --git a/go4k/compiler/featureset.go b/compiler/featureset.go
similarity index 95%
rename from go4k/compiler/featureset.go
rename to compiler/featureset.go
index 696a6c3..523ed50 100644
--- a/go4k/compiler/featureset.go
+++ b/compiler/featureset.go
@@ -3,7 +3,7 @@ package compiler
 import (
 	"sort"
 
-	"github.com/vsariola/sointu/go4k"
+	"github.com/vsariola/sointu"
 )
 
 // FeatureSet defines what opcodes / parameters are included in the compiled virtual machine
@@ -81,12 +81,12 @@ var allInputs map[paramKey]int
 var allTransformCounts map[string]int
 
 func init() {
-	allInstructions = make([]string, len(go4k.UnitTypes))
+	allInstructions = make([]string, len(sointu.UnitTypes))
 	allOpcodes = map[string]int{}
 	allTransformCounts = map[string]int{}
 	allInputs = map[paramKey]int{}
 	i := 0
-	for k, v := range go4k.UnitTypes {
+	for k, v := range sointu.UnitTypes {
 		inputCount := 0
 		transformCount := 0
 		for _, t := range v {
@@ -117,7 +117,7 @@ type NecessaryFeatures struct {
 	polyphony          bool
 }
 
-func NecessaryFeaturesFor(patch go4k.Patch) NecessaryFeatures {
+func NecessaryFeaturesFor(patch sointu.Patch) NecessaryFeatures {
 	features := NecessaryFeatures{opcodes: map[string]int{}, supportsParamValue: map[paramKey](map[int]bool){}, supportsModulation: map[paramKey]bool{}}
 	for instrNo, instrument := range patch.Instruments {
 		for _, unit := range instrument.Units {
@@ -146,7 +146,7 @@ func NecessaryFeaturesFor(patch go4k.Patch) NecessaryFeatures {
 				}
 				targetUnit := patch.Instruments[targetInstrument].Units[unit.Parameters["unit"]]
 				modulatedPortNo := 0
-				for _, v := range go4k.UnitTypes[targetUnit.Type] {
+				for _, v := range sointu.UnitTypes[targetUnit.Type] {
 					if v.CanModulate {
 						if modulatedPortNo == unit.Parameters["port"] {
 							features.supportsModulation[paramKey{targetUnit.Type, v.Name}] = true
diff --git a/go4k/compiler/generate.go b/compiler/generate.go
similarity index 97%
rename from go4k/compiler/generate.go
rename to compiler/generate.go
index f607614..4c34cc3 100644
--- a/go4k/compiler/generate.go
+++ b/compiler/generate.go
@@ -13,7 +13,7 @@ import (
 	"path/filepath"
 	"runtime"
 
-	"github.com/vsariola/sointu/go4k/compiler"
+	"github.com/vsariola/sointu/compiler"
 )
 
 func main() {
diff --git a/go4k/compiler/macros.go b/compiler/macros.go
similarity index 97%
rename from go4k/compiler/macros.go
rename to compiler/macros.go
index df0cf46..a7e572e 100644
--- a/go4k/compiler/macros.go
+++ b/compiler/macros.go
@@ -5,7 +5,7 @@ import (
 	"math"
 	"strings"
 
-	"github.com/vsariola/sointu/go4k"
+	"github.com/vsariola/sointu"
 )
 
 type OplistEntry struct {
@@ -39,11 +39,11 @@ func NewMacros(c Compiler, f FeatureSet) *Macros {
 		usesFloatConst: map[float32]bool{},
 		usesIntConst:   map[int]bool{},
 		stackframes:    map[string][]string{},
-		Sine:           go4k.Sine,
-		Trisaw:         go4k.Trisaw,
-		Pulse:          go4k.Pulse,
-		Gate:           go4k.Gate,
-		Sample:         go4k.Sample,
+		Sine:           sointu.Sine,
+		Trisaw:         sointu.Trisaw,
+		Pulse:          sointu.Pulse,
+		Gate:           sointu.Gate,
+		Sample:         sointu.Sample,
 		Compiler:       c,
 		FeatureSet:     f,
 	}
@@ -442,14 +442,14 @@ func (p *Macros) Use(value string, regs ...string) (string, error) {
 }
 
 type PlayerMacros struct {
-	Song              *go4k.Song
+	Song              *sointu.Song
 	VoiceTrackBitmask int
 	MaxSamples        int
 	Macros
 	EncodedPatch
 }
 
-func NewPlayerMacros(c Compiler, f FeatureSet, s *go4k.Song, e *EncodedPatch, maxSamples int) *PlayerMacros {
+func NewPlayerMacros(c Compiler, f FeatureSet, s *sointu.Song, e *EncodedPatch, maxSamples int) *PlayerMacros {
 	if maxSamples == 0 {
 		maxSamples = s.SamplesPerRow() * s.TotalRows()
 	}
diff --git a/go4k/bridge/bridge_test.go b/go4k/bridge/bridge_test.go
deleted file mode 100644
index d7e4456..0000000
--- a/go4k/bridge/bridge_test.go
+++ /dev/null
@@ -1,146 +0,0 @@
-package bridge_test
-
-import (
-	"bytes"
-	"encoding/binary"
-	"io/ioutil"
-	"path"
-	"runtime"
-	"testing"
-
-	"github.com/vsariola/sointu/go4k"
-	"github.com/vsariola/sointu/go4k/bridge"
-)
-
-func TestBridge(t *testing.T) {
-	patch := go4k.Patch{
-		Instruments: []go4k.Instrument{
-			go4k.Instrument{1, []go4k.Unit{
-				go4k.Unit{Type: "envelope", Parameters: map[string]int{"stereo": 0, "attack": 64, "decay": 64, "sustain": 64, "release": 80, "gain": 128}},
-				go4k.Unit{Type: "envelope", Parameters: map[string]int{"stereo": 0, "attack": 95, "decay": 64, "sustain": 64, "release": 80, "gain": 128}},
-				go4k.Unit{Type: "out", Parameters: map[string]int{"stereo": 1, "gain": 128}},
-			}}}}
-
-	synth, err := bridge.Synth(patch)
-	if err != nil {
-		t.Fatalf("bridge compile error: %v", err)
-	}
-	synth.Trigger(0, 64)
-	buffer := make([]float32, 2*su_max_samples)
-	err = go4k.Render(synth, buffer[:len(buffer)/2])
-	if err != nil {
-		t.Fatalf("first render gave an error")
-	}
-	synth.Release(0)
-	err = go4k.Render(synth, buffer[len(buffer)/2:])
-	if err != nil {
-		t.Fatalf("first render gave an error")
-	}
-	_, filename, _, _ := runtime.Caller(0)
-	expectedb, err := ioutil.ReadFile(path.Join(path.Dir(filename), "..", "..", "tests", "expected_output", "test_render_samples.raw"))
-	if err != nil {
-		t.Fatalf("cannot read expected: %v", err)
-	}
-	var createdbuf bytes.Buffer
-	err = binary.Write(&createdbuf, binary.LittleEndian, buffer)
-	if err != nil {
-		t.Fatalf("error converting buffer: %v", err)
-	}
-	createdb := createdbuf.Bytes()
-	if len(createdb) != len(expectedb) {
-		t.Fatalf("buffer length mismatch, got %v, expected %v", len(createdb), len(expectedb))
-	}
-	for i, v := range createdb {
-		if expectedb[i] != v {
-			t.Errorf("byte mismatch @ %v, got %v, expected %v", i, v, expectedb[i])
-			break
-		}
-	}
-}
-
-func TestStackUnderflow(t *testing.T) {
-	patch := go4k.Patch{
-		Instruments: []go4k.Instrument{
-			go4k.Instrument{1, []go4k.Unit{
-				go4k.Unit{Type: "pop", Parameters: map[string]int{}},
-			}}}}
-	synth, err := bridge.Synth(patch)
-	if err != nil {
-		t.Fatalf("bridge compile error: %v", err)
-	}
-	buffer := make([]float32, 2)
-	err = go4k.Render(synth, buffer)
-	if err == nil {
-		t.Fatalf("rendering should have failed due to stack underflow")
-	}
-}
-
-func TestStackBalancing(t *testing.T) {
-	patch := go4k.Patch{
-		Instruments: []go4k.Instrument{
-			go4k.Instrument{1, []go4k.Unit{
-				go4k.Unit{Type: "push", Parameters: map[string]int{}},
-			}}}}
-	synth, err := bridge.Synth(patch)
-	if err != nil {
-		t.Fatalf("bridge compile error: %v", err)
-	}
-	buffer := make([]float32, 2)
-	err = go4k.Render(synth, buffer)
-	if err == nil {
-		t.Fatalf("rendering should have failed due to unbalanced stack push/pop")
-	}
-}
-
-func TestStackOverflow(t *testing.T) {
-	patch := go4k.Patch{
-		Instruments: []go4k.Instrument{
-			go4k.Instrument{1, []go4k.Unit{
-				go4k.Unit{Type: "loadval", Parameters: map[string]int{"value": 128}},
-				go4k.Unit{Type: "loadval", Parameters: map[string]int{"value": 128}},
-				go4k.Unit{Type: "loadval", Parameters: map[string]int{"value": 128}},
-				go4k.Unit{Type: "loadval", Parameters: map[string]int{"value": 128}},
-				go4k.Unit{Type: "loadval", Parameters: map[string]int{"value": 128}},
-				go4k.Unit{Type: "loadval", Parameters: map[string]int{"value": 128}},
-				go4k.Unit{Type: "loadval", Parameters: map[string]int{"value": 128}},
-				go4k.Unit{Type: "loadval", Parameters: map[string]int{"value": 128}},
-				go4k.Unit{Type: "loadval", Parameters: map[string]int{"value": 128}},
-				go4k.Unit{Type: "pop", Parameters: map[string]int{}},
-				go4k.Unit{Type: "pop", Parameters: map[string]int{}},
-				go4k.Unit{Type: "pop", Parameters: map[string]int{}},
-				go4k.Unit{Type: "pop", Parameters: map[string]int{}},
-				go4k.Unit{Type: "pop", Parameters: map[string]int{}},
-				go4k.Unit{Type: "pop", Parameters: map[string]int{}},
-				go4k.Unit{Type: "pop", Parameters: map[string]int{}},
-				go4k.Unit{Type: "pop", Parameters: map[string]int{}},
-				go4k.Unit{Type: "pop", Parameters: map[string]int{}},
-			}}}}
-	synth, err := bridge.Synth(patch)
-	if err != nil {
-		t.Fatalf("bridge compile error: %v", err)
-	}
-	buffer := make([]float32, 2)
-	err = go4k.Render(synth, buffer)
-	if err == nil {
-		t.Fatalf("rendering should have failed due to stack overflow, despite balanced push/pops")
-	}
-}
-
-func TestDivideByZero(t *testing.T) {
-	patch := go4k.Patch{
-		Instruments: []go4k.Instrument{
-			go4k.Instrument{1, []go4k.Unit{
-				go4k.Unit{Type: "loadval", Parameters: map[string]int{"value": 128}},
-				go4k.Unit{Type: "invgain", Parameters: map[string]int{"invgain": 0}},
-				go4k.Unit{Type: "pop", Parameters: map[string]int{}},
-			}}}}
-	synth, err := bridge.Synth(patch)
-	if err != nil {
-		t.Fatalf("bridge compile error: %v", err)
-	}
-	buffer := make([]float32, 2)
-	err = go4k.Render(synth, buffer)
-	if err == nil {
-		t.Fatalf("rendering should have failed due to divide by zero")
-	}
-}
diff --git a/go4k/bridge/song_test.go b/go4k/bridge/song_test.go
deleted file mode 100644
index f26262c..0000000
--- a/go4k/bridge/song_test.go
+++ /dev/null
@@ -1,66 +0,0 @@
-package bridge_test
-
-import (
-	"bytes"
-	"encoding/binary"
-	"io/ioutil"
-	"path"
-	"runtime"
-	"testing"
-
-	"github.com/vsariola/sointu/go4k"
-	"github.com/vsariola/sointu/go4k/bridge"
-	// TODO: test the song using a mocks instead
-)
-
-const BPM = 100
-const SAMPLE_RATE = 44100
-const TOTAL_ROWS = 16
-const SAMPLES_PER_ROW = SAMPLE_RATE * 4 * 60 / (BPM * 16)
-
-const su_max_samples = SAMPLES_PER_ROW * TOTAL_ROWS
-
-// const bufsize = su_max_samples * 2
-
-func TestPlayer(t *testing.T) {
-	patch := go4k.Patch{
-		Instruments: []go4k.Instrument{go4k.Instrument{1, []go4k.Unit{
-			go4k.Unit{Type: "envelope", Parameters: map[string]int{"stereo": 0, "attack": 32, "decay": 32, "sustain": 64, "release": 64, "gain": 128}},
-			go4k.Unit{Type: "oscillator", Parameters: map[string]int{"stereo": 0, "transpose": 64, "detune": 64, "phase": 0, "color": 96, "shape": 64, "gain": 128, "type": go4k.Sine, "lfo": 0, "unison": 0}},
-			go4k.Unit{Type: "mulp", Parameters: map[string]int{"stereo": 0}},
-			go4k.Unit{Type: "envelope", Parameters: map[string]int{"stereo": 0, "attack": 32, "decay": 32, "sustain": 64, "release": 64, "gain": 128}},
-			go4k.Unit{Type: "oscillator", Parameters: map[string]int{"stereo": 0, "transpose": 72, "detune": 64, "phase": 64, "color": 64, "shape": 96, "gain": 128, "type": go4k.Sine, "lfo": 0, "unison": 0}},
-			go4k.Unit{Type: "mulp", Parameters: map[string]int{"stereo": 0}},
-			go4k.Unit{Type: "out", Parameters: map[string]int{"stereo": 1, "gain": 128}},
-		}}}}
-	patterns := [][]byte{{64, 0, 68, 0, 32, 0, 0, 0, 75, 0, 78, 0, 0, 0, 0, 0}}
-	tracks := []go4k.Track{go4k.Track{1, []byte{0}}}
-	song := go4k.Song{BPM: 100, Patterns: patterns, Tracks: tracks, Patch: patch, Output16Bit: false, Hold: 1}
-	synth, err := bridge.Synth(patch)
-	if err != nil {
-		t.Fatalf("Compiling patch failed: %v", err)
-	}
-	buffer, err := go4k.Play(synth, song)
-	if err != nil {
-		t.Fatalf("Render failed: %v", err)
-	}
-	_, filename, _, _ := runtime.Caller(0)
-	expectedb, err := ioutil.ReadFile(path.Join(path.Dir(filename), "..", "..", "tests", "expected_output", "test_oscillat_sine.raw"))
-	if err != nil {
-		t.Fatalf("cannot read expected: %v", err)
-	}
-	var createdbuf bytes.Buffer
-	err = binary.Write(&createdbuf, binary.LittleEndian, buffer)
-	if err != nil {
-		t.Fatalf("error converting buffer: %v", err)
-	}
-	createdb := createdbuf.Bytes()
-	if len(createdb) != len(expectedb) {
-		t.Fatalf("buffer length mismatch, got %v, expected %v", len(createdb), len(expectedb))
-	}
-	for i, v := range createdb {
-		if expectedb[i] != v {
-			t.Fatalf("byte mismatch @ %v, got %v, expected %v", i, v, expectedb[i])
-		}
-	}
-}
diff --git a/go4k/go4k.go b/sointu.go
similarity index 98%
rename from go4k/go4k.go
rename to sointu.go
index 638873e..92fef70 100644
--- a/go4k/go4k.go
+++ b/sointu.go
@@ -1,4 +1,4 @@
-package go4k
+package sointu
 
 import (
 	"errors"
@@ -68,10 +68,10 @@ type Synth interface {
 func Render(synth Synth, buffer []float32) error {
 	s, _, err := synth.Render(buffer, math.MaxInt32)
 	if err != nil {
-		return fmt.Errorf("go4k.Render failed: %v", err)
+		return fmt.Errorf("sointu.Render failed: %v", err)
 	}
 	if s != len(buffer)/2 {
-		return errors.New("in go4k.Render, synth.Render should have filled the whole buffer but did not")
+		return errors.New("in sointu.Render, synth.Render should have filled the whole buffer but did not")
 	}
 	return nil
 }
diff --git a/templates/sources.asm b/templates/sources.asm
index e2af319..323c6e5 100644
--- a/templates/sources.asm
+++ b/templates/sources.asm
@@ -279,9 +279,9 @@ su_oscillat_sine_do:
     pop     {{.AX}}
     and     al, 0xf                         ; ax=int(16*p) & 15, stack: 1
     bt      word [{{.VAL}}-4],ax                 ; if bit ax of the gate word is set
-    jc      go4kVCO_gate_bit                ;   goto gate_bit
+    jc      su_oscillat_gate_bit                ;   goto gate_bit
     fsub    st0, st0                        ; stack: 0
-go4kVCO_gate_bit:                           ; stack: 0/1, let's call it x
+su_oscillat_gate_bit:                           ; stack: 0/1, let's call it x
     fld     dword [{{.WRK}}+16] ; g x, g is gatestate, x is the input to this filter 0/1
     fsub    st1                             ; g-x x
 {{- .Float 0.99609375 | .Prepare | indent 4}}
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 8476446..468f1f8 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -1,11 +1,11 @@
-function(regression_test testname)    
-   
+function(regression_test testname)
+
     if(${ARGC} LESS 4)
         set(source ${testname}.yml)
         set(asmfile ${testname}.asm)
         set (headerfile ${CMAKE_CURRENT_BINARY_DIR}/${testname}.h)
 
-        add_custom_command(            
+        add_custom_command(
             OUTPUT ${asmfile}
             COMMAND ${sointuexe} -a -c -w -arch=${arch} -d ${CMAKE_CURRENT_BINARY_DIR} ${CMAKE_CURRENT_SOURCE_DIR}/${source}
             DEPENDS ${source} ${sointuexe}
@@ -16,7 +16,7 @@ function(regression_test testname)
     else()
         set(source ${ARGV3})
         add_executable(${testname} ${source} test_renderer.c)
-    endif()    
+    endif()
 
     add_test(${testname} ${testname})
     target_link_libraries(${testname} ${HEADERLIB})
@@ -31,7 +31,7 @@ function(regression_test testname)
     add_dependencies(${testname} ${testname}_rawcopy)
 
     target_include_directories(${testname} PUBLIC ${CMAKE_CURRENT_BINARY_DIR})
-    target_compile_definitions(${testname} PUBLIC TEST_NAME="${testname}")    
+    target_compile_definitions(${testname} PUBLIC TEST_NAME="${testname}")
 
     if(ARGC GREATER 1)
         if (ARGV1)
@@ -49,12 +49,12 @@ function(regression_test testname)
 endfunction(regression_test)
 
 
-# Build sointu-cli only once because go run has everytime quite a bit of delay when 
+# Build sointu-cli only once because go run has everytime quite a bit of delay when
 # starting
-add_custom_command(            
+add_custom_command(
     OUTPUT ${sointuexe}
-    COMMAND go build -o ${sointuexe} ${PROJECT_SOURCE_DIR}/go4k/cmd/sointu-cli/main.go
-    DEPENDS "${templates}" "${go4k}" "${compilersrc}" ${STATICLIB}
+    COMMAND go build -o ${sointuexe} ${PROJECT_SOURCE_DIR}/cmd/sointu-cli/main.go
+    DEPENDS "${templates}" "${sointu}" "${compilersrc}" ${STATICLIB}
 )
 
 regression_test(test_envelope "" ENVELOPE)
diff --git a/go4k/tracker/defaultsong.go b/tracker/defaultsong.go
similarity index 78%
rename from go4k/tracker/defaultsong.go
rename to tracker/defaultsong.go
index 78065b7..e381617 100644
--- a/go4k/tracker/defaultsong.go
+++ b/tracker/defaultsong.go
@@ -1,24 +1,24 @@
 package tracker
 
-import "github.com/vsariola/sointu/go4k"
+import "github.com/vsariola/sointu"
 
-var defaultSong = go4k.Song{
+var defaultSong = sointu.Song{
 	BPM: 100,
 	Patterns: [][]byte{
 		{64, 0, 68, 0, 32, 0, 0, 0, 75, 0, 78, 0, 0, 0, 0, 0},
 		{0, 0, 64, 0, 68, 0, 32, 0, 0, 0, 75, 0, 78, 0, 0, 0},
 	},
-	Tracks: []go4k.Track{
+	Tracks: []sointu.Track{
 		{NumVoices: 1, Sequence: []byte{0}},
 		{NumVoices: 1, Sequence: []byte{1}},
 	},
-	Patch: go4k.Patch{
-		Instruments: []go4k.Instrument{{NumVoices: 2, Units: []go4k.Unit{
+	Patch: sointu.Patch{
+		Instruments: []sointu.Instrument{{NumVoices: 2, Units: []sointu.Unit{
 			{Type: "envelope", Parameters: map[string]int{"stereo": 0, "attack": 32, "decay": 32, "sustain": 64, "release": 64, "gain": 128}},
-			{Type: "oscillator", Parameters: map[string]int{"stereo": 0, "transpose": 64, "detune": 64, "phase": 0, "color": 96, "shape": 64, "gain": 128, "type": go4k.Sine}},
+			{Type: "oscillator", Parameters: map[string]int{"stereo": 0, "transpose": 64, "detune": 64, "phase": 0, "color": 96, "shape": 64, "gain": 128, "type": sointu.Sine}},
 			{Type: "mulp", Parameters: map[string]int{"stereo": 0}},
 			{Type: "envelope", Parameters: map[string]int{"stereo": 0, "attack": 32, "decay": 32, "sustain": 64, "release": 64, "gain": 128}},
-			{Type: "oscillator", Parameters: map[string]int{"stereo": 0, "transpose": 72, "detune": 64, "phase": 64, "color": 64, "shape": 96, "gain": 128, "type": go4k.Sine}},
+			{Type: "oscillator", Parameters: map[string]int{"stereo": 0, "transpose": 72, "detune": 64, "phase": 64, "color": 64, "shape": 96, "gain": 128, "type": sointu.Sine}},
 			{Type: "mulp", Parameters: map[string]int{"stereo": 0}},
 			{Type: "out", Parameters: map[string]int{"stereo": 1, "gain": 128}},
 		}}}},
diff --git a/go4k/tracker/keyevent.go b/tracker/keyevent.go
similarity index 100%
rename from go4k/tracker/keyevent.go
rename to tracker/keyevent.go
diff --git a/go4k/tracker/label.go b/tracker/label.go
similarity index 100%
rename from go4k/tracker/label.go
rename to tracker/label.go
diff --git a/go4k/tracker/layout.go b/tracker/layout.go
similarity index 100%
rename from go4k/tracker/layout.go
rename to tracker/layout.go
diff --git a/go4k/tracker/music.go b/tracker/music.go
similarity index 100%
rename from go4k/tracker/music.go
rename to tracker/music.go
diff --git a/go4k/tracker/panels.go b/tracker/panels.go
similarity index 100%
rename from go4k/tracker/panels.go
rename to tracker/panels.go
diff --git a/go4k/tracker/run.go b/tracker/run.go
similarity index 100%
rename from go4k/tracker/run.go
rename to tracker/run.go
diff --git a/go4k/tracker/sequencer.go b/tracker/sequencer.go
similarity index 100%
rename from go4k/tracker/sequencer.go
rename to tracker/sequencer.go
diff --git a/go4k/tracker/theme.go b/tracker/theme.go
similarity index 100%
rename from go4k/tracker/theme.go
rename to tracker/theme.go
diff --git a/go4k/tracker/track.go b/tracker/track.go
similarity index 100%
rename from go4k/tracker/track.go
rename to tracker/track.go
diff --git a/go4k/tracker/tracker.go b/tracker/tracker.go
similarity index 85%
rename from go4k/tracker/tracker.go
rename to tracker/tracker.go
index e025081..9e6a05a 100644
--- a/go4k/tracker/tracker.go
+++ b/tracker/tracker.go
@@ -3,14 +3,14 @@ package tracker
 import (
 	"fmt"
 	"gioui.org/widget"
-	"github.com/vsariola/sointu/go4k"
-	"github.com/vsariola/sointu/go4k/audio"
-	"github.com/vsariola/sointu/go4k/bridge"
+	"github.com/vsariola/sointu"
+	"github.com/vsariola/sointu/audio"
+	"github.com/vsariola/sointu/bridge"
 )
 
 type Tracker struct {
 	QuitButton     *widget.Clickable
-	song           go4k.Song
+	song           sointu.Song
 	CursorRow      int
 	CursorColumn   int
 	DisplayPattern int
@@ -24,12 +24,12 @@ type Tracker struct {
 	rowJump        chan int
 	patternJump    chan int
 	player         audio.Player
-	synth          go4k.Synth
+	synth          sointu.Synth
 	playBuffer     []float32
 	closer         chan struct{}
 }
 
-func (t *Tracker) LoadSong(song go4k.Song) error {
+func (t *Tracker) LoadSong(song sointu.Song) error {
 	if err := song.Validate(); err != nil {
 		return fmt.Errorf("invalid song: %w", err)
 	}