diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index c68bc81..0156329 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -122,3 +122,4 @@ regression_test(test_envelope_16bit ENVELOPE "" test_envelope)
 target_compile_definitions(test_envelope_16bit PUBLIC SU_USE_16BIT_OUTPUT)
 
 regression_test(test_polyphony "ENVELOPE;VCO_SINE")
+regression_test(test_chords "ENVELOPE;VCO_SINE")
diff --git a/tests/expected_output/test_chords.raw b/tests/expected_output/test_chords.raw
new file mode 100644
index 0000000..0e28a1c
Binary files /dev/null and b/tests/expected_output/test_chords.raw differ
diff --git a/tests/test_chords.asm b/tests/test_chords.asm
new file mode 100644
index 0000000..105f2ac
--- /dev/null
+++ b/tests/test_chords.asm
@@ -0,0 +1,29 @@
+%define BPM 100
+%define USE_SECTIONS
+
+%include "../src/sointu.inc"
+
+SU_BEGIN_PATTERNS
+    PATTERN 64, 0, 0, 0, 68, 0, 0, 0,    66, 0, 0, 0,   69, 0, 0, 0,
+    PATTERN 0, 68, 0, 0, 71, 0, 0, 0,    69, 0, 0, 0,   73, 0, 0, 0,
+    PATTERN 0, 0, 71, 0, 75, 0, 0, 0,    73, 0, 0, 0,   76, 0, 0, 0,
+SU_END_PATTERNS
+
+SU_BEGIN_TRACKS
+    TRACK VOICES(1),0
+    TRACK VOICES(1),1
+    TRACK VOICES(1),2
+SU_END_TRACKS
+
+SU_BEGIN_PATCH
+    SU_BEGIN_INSTRUMENT VOICES(3) ; Instrument0
+        SU_ENVELOPE MONO,ATTAC(64),DECAY(64),SUSTAIN(64),RELEASE(64),GAIN(32)
+        SU_ENVELOPE MONO,ATTAC(64),DECAY(64),SUSTAIN(64),RELEASE(64),GAIN(32)
+        SU_OSCILLAT MONO,TRANSPOSE(88),DETUNE(64),PHASE(0),COLOR(128),SHAPE(64),GAIN(128),FLAGS(SINE)
+        SU_OSCILLAT MONO,TRANSPOSE(88),DETUNE(64),PHASE(0),COLOR(128),SHAPE(64),GAIN(128),FLAGS(SINE)
+        SU_MULP     STEREO
+        SU_OUT      STEREO,GAIN(128)
+    SU_END_INSTRUMENT
+SU_END_PATCH
+
+%include "../src/sointu.asm"
diff --git a/tests/test_polyphony.asm b/tests/test_polyphony.asm
index dbe56f0..63c5348 100644
--- a/tests/test_polyphony.asm
+++ b/tests/test_polyphony.asm
@@ -12,7 +12,15 @@ SU_BEGIN_TRACKS
 SU_END_TRACKS
 
 SU_BEGIN_PATCH
-    SU_BEGIN_INSTRUMENT VOICES(2) ; Instrument0
+    SU_BEGIN_INSTRUMENT VOICES(1) ; Instrument0
+        SU_ENVELOPE MONO,ATTAC(64),DECAY(64),SUSTAIN(64),RELEASE(64),GAIN(128)
+        SU_ENVELOPE MONO,ATTAC(64),DECAY(64),SUSTAIN(64),RELEASE(64),GAIN(128)
+        SU_OSCILLAT MONO,TRANSPOSE(64),DETUNE(64),PHASE(0),COLOR(128),SHAPE(64),GAIN(128),FLAGS(SINE)
+        SU_OSCILLAT MONO,TRANSPOSE(64),DETUNE(64),PHASE(0),COLOR(128),SHAPE(64),GAIN(128),FLAGS(SINE)
+        SU_MULP     STEREO
+        SU_OUT      STEREO,GAIN(128)
+    SU_END_INSTRUMENT
+    SU_BEGIN_INSTRUMENT VOICES(1) ; Instrument1
         SU_ENVELOPE MONO,ATTAC(64),DECAY(64),SUSTAIN(64),RELEASE(64),GAIN(128)
         SU_ENVELOPE MONO,ATTAC(64),DECAY(64),SUSTAIN(64),RELEASE(64),GAIN(128)
         SU_OSCILLAT MONO,TRANSPOSE(64),DETUNE(64),PHASE(0),COLOR(128),SHAPE(64),GAIN(128),FLAGS(SINE)