diff --git a/song.go b/song.go
index ab1ad95..11b3cdd 100644
--- a/song.go
+++ b/song.go
@@ -2,7 +2,6 @@ package sointu
 
 import (
 	"errors"
-	"iter"
 )
 
 type (
@@ -336,32 +335,3 @@ func TotalVoices[T any, S ~[]T, P NumVoicerPointer[T]](slice S) (ret int) {
 	}
 	return
 }
-
-func (s *Song) InstrumentForTrack(trackIndex int) (int, bool) {
-	voiceIndex := s.Score.FirstVoiceForTrack(trackIndex)
-	instrument, err := s.Patch.InstrumentForVoice(voiceIndex)
-	return instrument, err == nil
-}
-
-func (s *Song) AllTracksWithSameInstrument(trackIndex int) iter.Seq[int] {
-	return func(yield func(int) bool) {
-
-		currentInstrument, currentExists := s.InstrumentForTrack(trackIndex)
-		if !currentExists {
-			return
-		}
-
-		for i := 0; i < len(s.Score.Tracks); i++ {
-			instrument, exists := s.InstrumentForTrack(i)
-			if !exists {
-				return
-			}
-			if instrument != currentInstrument {
-				continue
-			}
-			if !yield(i) {
-				return
-			}
-		}
-	}
-}
diff --git a/tracker/derived.go b/tracker/derived.go
new file mode 100644
index 0000000..e57c8b6
--- /dev/null
+++ b/tracker/derived.go
@@ -0,0 +1,235 @@
+package tracker
+
+import (
+	"github.com/vsariola/sointu"
+	"iter"
+	"slices"
+)
+
+/*
+	from modelData we can derive useful information that can be cached for performance
+	or easy access, because of nested iterations over the score or patch data.
+	i.e. this needs to update when the model changes, and only then.
+*/
+
+type (
+	derivedForUnit struct {
+		unit       *sointu.Unit
+		instrument *sointu.Instrument
+		sends      []*sointu.Unit
+	}
+
+	derivedForTrack struct {
+		instrumentRange          []int
+		tracksWithSameInstrument []int
+		title                    string
+	}
+
+	derivedModelData struct {
+		// map unit by ID
+		forUnit map[int]derivedForUnit
+		// map track by index
+		forTrack map[int]derivedForTrack
+	}
+)
+
+// public access functions
+
+func (m *Model) forUnitById(id int) *derivedForUnit {
+	forUnit, ok := m.derived.forUnit[id]
+	if !ok {
+		return nil
+	}
+	return &forUnit
+}
+
+func (m *Model) InstrumentForUnit(id int) *sointu.Instrument {
+	fu := m.forUnitById(id)
+	if fu == nil {
+		return nil
+	}
+	return fu.instrument
+}
+
+func (m *Model) UnitById(id int) *sointu.Unit {
+	fu := m.forUnitById(id)
+	if fu == nil {
+		return nil
+	}
+	return fu.unit
+}
+
+func (m *Model) SendTargetsForUnit(id int) []*sointu.Unit {
+	fu := m.forUnitById(id)
+	if fu == nil {
+		return nil
+	}
+	return fu.sends
+}
+
+func (m *Model) forTrackByIndex(index int) *derivedForTrack {
+	forTrack, ok := m.derived.forTrack[index]
+	if !ok {
+		return nil
+	}
+	return &forTrack
+}
+
+func (m *Model) TrackTitle(index int) string {
+	ft := m.forTrackByIndex(index)
+	if ft == nil {
+		return ""
+	}
+	return ft.title
+}
+
+// public getters with further model information
+
+func (m *Model) TracksWithSameInstrumentAsCurrent() []int {
+	currentTrack := m.d.Cursor.Track
+	return m.derived.forTrack[currentTrack].tracksWithSameInstrument
+}
+
+func (m *Model) CountNextTracksForCurrentInstrument() int {
+	currentTrack := m.d.Cursor.Track
+	count := 0
+	for t := range m.TracksWithSameInstrumentAsCurrent() {
+		if t > currentTrack {
+			count++
+		}
+	}
+	return count
+}
+
+// init / update methods
+
+func (m *Model) initDerivedData() {
+	m.derived = derivedModelData{
+		forUnit:  make(map[int]derivedForUnit),
+		forTrack: make(map[int]derivedForTrack),
+	}
+	m.updateDerivedScoreData()
+	m.updateDerivedPatchData()
+}
+
+func (m *Model) updateDerivedScoreData() {
+	for index, _ := range m.d.Song.Score.Tracks {
+		firstInstr, lastInstr, _ := m.instrumentRangeFor(index)
+		m.derived.forTrack[index] = derivedForTrack{
+			instrumentRange:          []int{firstInstr, lastInstr},
+			tracksWithSameInstrument: slices.Collect(m.tracksWithSameInstrument(index)),
+			title:                    m.buildTrackTitle(index),
+		}
+	}
+}
+
+func (m *Model) updateDerivedPatchData() {
+	for _, instr := range m.d.Song.Patch {
+		for _, unit := range instr.Units {
+			m.derived.forUnit[unit.ID] = derivedForUnit{
+				unit:       &unit,
+				instrument: &instr,
+				sends:      slices.Collect(m.collectSendsTo(unit)),
+			}
+		}
+	}
+}
+
+// internals...
+
+func (m *Model) collectSendsTo(unit sointu.Unit) iter.Seq[*sointu.Unit] {
+	return func(yield func(*sointu.Unit) bool) {
+		for _, instr := range m.d.Song.Patch {
+			for _, u := range instr.Units {
+				if u.Type != "send" {
+					continue
+				}
+				targetId, ok := u.Parameters["target"]
+				if !ok || targetId != unit.ID {
+					continue
+				}
+				if !yield(&u) {
+					return
+				}
+			}
+		}
+	}
+}
+
+func (m *Model) instrumentRangeFor(trackIndex int) (int, int, error) {
+	track := m.d.Song.Score.Tracks[trackIndex]
+	firstVoice := m.d.Song.Score.FirstVoiceForTrack(trackIndex)
+	lastVoice := firstVoice + track.NumVoices - 1
+	firstIndex, err1 := m.d.Song.Patch.InstrumentForVoice(firstVoice)
+	if err1 != nil {
+		return trackIndex, trackIndex, err1
+	}
+	lastIndex, err2 := m.d.Song.Patch.InstrumentForVoice(lastVoice)
+	if err2 != nil {
+		return trackIndex, trackIndex, err2
+	}
+	return firstIndex, lastIndex, nil
+}
+
+func (m *Model) buildTrackTitle(x int) (title string) {
+	title = "?"
+	if x < 0 || x >= len(m.d.Song.Score.Tracks) {
+		return
+	}
+	firstIndex, lastIndex, err := m.instrumentRangeFor(x)
+	if err != nil {
+		return
+	}
+	switch diff := lastIndex - firstIndex; diff {
+	case 0:
+		title = m.d.Song.Patch[firstIndex].Name
+	default:
+		n1 := m.d.Song.Patch[firstIndex].Name
+		n2 := m.d.Song.Patch[firstIndex+1].Name
+		if len(n1) > 0 {
+			n1 = string(n1[0])
+		} else {
+			n1 = "?"
+		}
+		if len(n2) > 0 {
+			n2 = string(n2[0])
+		} else {
+			n2 = "?"
+		}
+		if diff > 1 {
+			title = n1 + "/" + n2 + "..."
+		} else {
+			title = n1 + "/" + n2
+		}
+	}
+	return
+}
+
+func (m *Model) instrumentForTrack(trackIndex int) (int, bool) {
+	voiceIndex := m.d.Song.Score.FirstVoiceForTrack(trackIndex)
+	instrument, err := m.d.Song.Patch.InstrumentForVoice(voiceIndex)
+	return instrument, err == nil
+}
+
+func (m *Model) tracksWithSameInstrument(trackIndex int) iter.Seq[int] {
+	return func(yield func(int) bool) {
+
+		currentInstrument, currentExists := m.instrumentForTrack(trackIndex)
+		if !currentExists {
+			return
+		}
+
+		for i := 0; i < len(m.d.Song.Score.Tracks); i++ {
+			instrument, exists := m.instrumentForTrack(i)
+			if !exists {
+				return
+			}
+			if instrument != currentInstrument {
+				continue
+			}
+			if !yield(i) {
+				return
+			}
+		}
+	}
+}
diff --git a/tracker/gioui/note_editor.go b/tracker/gioui/note_editor.go
index 086a622..f03dea0 100644
--- a/tracker/gioui/note_editor.go
+++ b/tracker/gioui/note_editor.go
@@ -220,12 +220,11 @@ func (te *NoteEditor) layoutTracks(gtx C, t *Tracker) D {
 	pxRowMarkWidth := gtx.Dp(trackRowMarkWidth)
 
 	colTitle := func(gtx C, i int) D {
-		h := gtx.Dp(unit.Dp(trackColTitleHeight))
-		title := ((*tracker.Order)(t.Model)).Title(i)
+		h := gtx.Dp(trackColTitleHeight)
 		gtx.Constraints = layout.Exact(image.Pt(pxWidth, h))
 		LabelStyle{
 			Alignment: layout.N,
-			Text:      title,
+			Text:      t.Model.TrackTitle(i),
 			FontSize:  unit.Sp(12),
 			Color:     mediumEmphasisTextColor,
 			Shaper:    t.Theme.Shaper,
@@ -294,7 +293,7 @@ func (te *NoteEditor) layoutTracks(gtx C, t *Tracker) D {
 		}
 		// draw the corresponding "fake cursors" for instrument-track-groups (for polyphony)
 		if hasTrackMidiIn {
-			for trackIndex := range ((*tracker.Order)(t.Model)).TrackIndicesForCurrentInstrument() {
+			for trackIndex := range t.Model.TracksWithSameInstrumentAsCurrent() {
 				if x == trackIndex && y == cursor.Y {
 					te.paintColumnCell(gtx, x, t, cursorNeighborForTrackMidiInColor)
 				}
@@ -414,7 +413,7 @@ func (te *NoteEditor) HandleMidiInput(t *Tracker) {
 		return
 	}
 	te.scrollTable.Table.SetCursor2(te.scrollTable.Table.Cursor())
-	remaining := (*tracker.Order)(t.Model).CountNextTracksForCurrentInstrument()
+	remaining := t.Model.CountNextTracksForCurrentInstrument()
 	for i, note := range t.MidiNotePlaying {
 		t.Model.Notes().Table().Set(note)
 		te.scrollTable.Table.MoveCursor(1, 0)
diff --git a/tracker/gioui/order_editor.go b/tracker/gioui/order_editor.go
index 79f8529..06b853d 100644
--- a/tracker/gioui/order_editor.go
+++ b/tracker/gioui/order_editor.go
@@ -68,8 +68,13 @@ func (oe *OrderEditor) Layout(gtx C, t *Tracker) D {
 		defer op.Offset(image.Pt(0, -2)).Push(gtx.Ops).Pop()
 		defer op.Affine(f32.Affine2D{}.Rotate(f32.Pt(0, 0), -90*math.Pi/180).Offset(f32.Point{X: 0, Y: float32(h)})).Push(gtx.Ops).Pop()
 		gtx.Constraints = layout.Exact(image.Pt(1e6, 1e6))
-		title := t.Model.Order().Title(i)
-		LabelStyle{Alignment: layout.NW, Text: title, FontSize: unit.Sp(12), Color: mediumEmphasisTextColor, Shaper: t.Theme.Shaper}.Layout(gtx)
+		LabelStyle{
+			Alignment: layout.NW,
+			Text:      t.Model.TrackTitle(i),
+			FontSize:  unit.Sp(12),
+			Color:     mediumEmphasisTextColor,
+			Shaper:    t.Theme.Shaper,
+		}.Layout(gtx)
 		return D{Size: image.Pt(gtx.Dp(patternCellWidth), h)}
 	}
 
diff --git a/tracker/gioui/unit_editor.go b/tracker/gioui/unit_editor.go
index f0adee4..0e711f7 100644
--- a/tracker/gioui/unit_editor.go
+++ b/tracker/gioui/unit_editor.go
@@ -247,20 +247,26 @@ type ParameterWidget struct {
 }
 
 type ParameterStyle struct {
-	tracker *Tracker
-	w       *ParameterWidget
-	Theme   *material.Theme
-	Focus   bool
-	sends   []sointu.Unit
+	tracker         *Tracker
+	w               *ParameterWidget
+	Theme           *material.Theme
+	SendTargetTheme *material.Theme
+	Focus           bool
+	sends           []sointu.Unit
 }
 
 func (t *Tracker) ParamStyle(th *material.Theme, paramWidget *ParameterWidget) ParameterStyle {
-	sends := slices.Collect(t.Model.CollectSendsTo(paramWidget.Parameter))
+	sendTargetTheme := th.WithPalette(material.Palette{
+		Bg:         th.Bg,
+		Fg:         paramIsSendTargetColor,
+		ContrastBg: th.ContrastBg,
+		ContrastFg: th.ContrastFg,
+	})
 	return ParameterStyle{
-		tracker: t, // TODO: we need this to pull the instrument names for ID style parameters, find out another way
-		Theme:   th,
-		w:       paramWidget,
-		sends:   sends,
+		tracker:         t, // TODO: we need this to pull the instrument names for ID style parameters, find out another way
+		Theme:           th,
+		SendTargetTheme: &sendTargetTheme,
+		w:               paramWidget,
 	}
 }
 
@@ -296,7 +302,6 @@ func (p ParameterStyle) Layout(gtx C) D {
 				}
 				sliderStyle := material.Slider(p.Theme, &p.w.floatWidget)
 				sliderStyle.Color = p.Theme.Fg
-
 				if len(sends) > 0 {
 					sliderStyle.Color = paramIsSendTargetColor
 				}
@@ -374,11 +379,11 @@ func (p ParameterStyle) Layout(gtx C) D {
 		layout.Rigid(func(gtx C) D {
 			if p.w.Parameter.Type() != tracker.IDParameter {
 				label := Label(p.w.Parameter.Hint(), white, p.tracker.Theme.Shaper)
-				info := p.buildTooltip(sends)
+				info := p.buildSendTargetTooltip(sends)
 				if info == "" {
 					return label(gtx)
 				}
-				tooltip := component.PlatformTooltip(p.Theme, info)
+				tooltip := component.PlatformTooltip(p.SendTargetTheme, info)
 				return p.w.tipArea.Layout(gtx, tooltip, label)
 			}
 			return D{}
@@ -413,7 +418,7 @@ func (p ParameterStyle) findSends() iter.Seq[sointu.Unit] {
 	}
 }
 
-func (p ParameterStyle) buildTooltip(sends []sointu.Unit) string {
+func (p ParameterStyle) buildSendTargetTooltip(sends []sointu.Unit) string {
 	if len(sends) == 0 {
 		return ""
 	}
@@ -424,7 +429,7 @@ func (p ParameterStyle) buildTooltip(sends []sointu.Unit) string {
 		sourceInstr := p.tracker.Model.InstrumentForUnit(sends[0].ID)
 		sourceInfo := ""
 		if sourceInstr != targetInstr {
-			sourceInfo = fmt.Sprintf(" (%s)", sourceInstr.Name)
+			sourceInfo = fmt.Sprintf(" from \"%s\"", sourceInstr.Name)
 		}
 		if amounts == "" {
 			amounts = fmt.Sprintf("x %d%s", sends[i].Parameters["amount"], sourceInfo)
diff --git a/tracker/model.go b/tracker/model.go
index 5d759cc..02dba9e 100644
--- a/tracker/model.go
+++ b/tracker/model.go
@@ -4,7 +4,6 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
-	"iter"
 	"os"
 	"path/filepath"
 
@@ -40,7 +39,8 @@ type (
 	}
 
 	Model struct {
-		d modelData
+		d       modelData
+		derived derivedModelData
 
 		instrEnlarged   bool
 		commentExpanded bool
@@ -202,6 +202,7 @@ func NewModel(broker *Broker, synther sointu.Synther, midiContext MIDIContext, r
 	}
 	trySend(broker.ToPlayer, any(m.d.Song.Copy())) // we should be non-blocking in the constructor
 	m.signalAnalyzer = NewScopeModel(broker, m.d.Song.BPM)
+	m.initDerivedData()
 	return m
 }
 
@@ -236,6 +237,7 @@ func (m *Model) change(kind string, t ChangeType, severity ChangeSeverity) func(
 				m.updatePatternUseCount()
 				m.d.Cursor.SongPos = m.d.Song.Score.Clamp(m.d.Cursor.SongPos)
 				m.d.Cursor2.SongPos = m.d.Song.Score.Clamp(m.d.Cursor2.SongPos)
+				m.updateDerivedScoreData()
 				trySend(m.broker.ToPlayer, any(m.d.Song.Score.Copy()))
 			}
 			if m.changeType&PatchChange != 0 {
@@ -251,6 +253,7 @@ func (m *Model) change(kind string, t ChangeType, severity ChangeSeverity) func(
 				m.d.UnitIndex2 = clamp(m.d.UnitIndex2, 0, unitCount-1)
 				m.d.UnitSearching = false // if we change anything in the patch, reset the unit searching
 				m.d.UnitSearchString = ""
+				m.updateDerivedPatchData()
 				trySend(m.broker.ToPlayer, any(m.d.Song.Patch.Copy()))
 			}
 			if m.changeType&BPMChange != 0 {
@@ -598,38 +601,3 @@ func clamp(a, min, max int) int {
 	}
 	return a
 }
-
-func (m *Model) CollectSendsTo(param Parameter) iter.Seq[sointu.Unit] {
-	return func(yield func(sointu.Unit) bool) {
-		p, ok := param.(NamedParameter)
-		if !ok {
-			return
-		}
-		for _, instr := range m.d.Song.Patch {
-			for _, unit := range instr.Units {
-				if unit.Type != "send" {
-					continue
-				}
-				targetId, ok := unit.Parameters["target"]
-				if !ok || targetId != p.Unit().ID {
-					continue
-				}
-				if !yield(unit) {
-					return
-				}
-			}
-		}
-	}
-}
-
-func (m *Model) InstrumentForUnit(id int) *sointu.Instrument {
-	for _, instr := range m.d.Song.Patch {
-		for _, unit := range instr.Units {
-			if unit.ID == id {
-				return &instr
-			}
-		}
-	}
-	// ID does not exist
-	return nil
-}
diff --git a/tracker/table.go b/tracker/table.go
index d598d10..a270218 100644
--- a/tracker/table.go
+++ b/tracker/table.go
@@ -1,7 +1,6 @@
 package tracker
 
 import (
-	"iter"
 	"math"
 
 	"github.com/vsariola/sointu"
@@ -367,71 +366,6 @@ func (m *Order) SetValue(p Point, val int) {
 	m.d.Song.Score.Tracks[p.X].Order.Set(p.Y, val)
 }
 
-func (e *Order) Title(x int) (title string) {
-	title = "?"
-	if x < 0 || x >= len(e.d.Song.Score.Tracks) {
-		return
-	}
-	firstIndex, lastIndex, err := e.instrumentListFor(x)
-	if err != nil {
-		return
-	}
-	switch diff := lastIndex - firstIndex; diff {
-	case 0:
-		title = e.d.Song.Patch[firstIndex].Name
-	default:
-		n1 := e.d.Song.Patch[firstIndex].Name
-		n2 := e.d.Song.Patch[firstIndex+1].Name
-		if len(n1) > 0 {
-			n1 = string(n1[0])
-		} else {
-			n1 = "?"
-		}
-		if len(n2) > 0 {
-			n2 = string(n2[0])
-		} else {
-			n2 = "?"
-		}
-		if diff > 1 {
-			title = n1 + "/" + n2 + "..."
-		} else {
-			title = n1 + "/" + n2
-		}
-	}
-	return
-}
-
-func (e *Order) instrumentListFor(trackIndex int) (int, int, error) {
-	track := e.d.Song.Score.Tracks[trackIndex]
-	firstVoice := e.d.Song.Score.FirstVoiceForTrack(trackIndex)
-	lastVoice := firstVoice + track.NumVoices - 1
-	firstIndex, err1 := e.d.Song.Patch.InstrumentForVoice(firstVoice)
-	if err1 != nil {
-		return trackIndex, trackIndex, err1
-	}
-	lastIndex, err2 := e.d.Song.Patch.InstrumentForVoice(lastVoice)
-	if err2 != nil {
-		return trackIndex, trackIndex, err2
-	}
-	return firstIndex, lastIndex, nil
-}
-
-func (e *Order) TrackIndicesForCurrentInstrument() iter.Seq[int] {
-	currentTrack := e.d.Cursor.Track
-	return e.d.Song.AllTracksWithSameInstrument(currentTrack)
-}
-
-func (e *Order) CountNextTracksForCurrentInstrument() int {
-	currentTrack := e.d.Cursor.Track
-	count := 0
-	for t := range e.TrackIndicesForCurrentInstrument() {
-		if t > currentTrack {
-			count++
-		}
-	}
-	return count
-}
-
 // NoteTable
 
 func (v *Notes) Table() Table {