diff --git a/tracker/instruments.go b/tracker/instruments.go
index ef1f9f6..61eee1a 100644
--- a/tracker/instruments.go
+++ b/tracker/instruments.go
@@ -67,6 +67,20 @@ func (t *Tracker) layoutInstrumentHeader() layout.Widget {
 			deleteInstrumentBtnStyle.Color = disabledTextColor
 		}
 		return layout.Flex{Axis: layout.Horizontal}.Layout(gtx,
+			layout.Rigid(Label("Voices:", white)),
+			layout.Rigid(func(gtx layout.Context) layout.Dimensions {
+				maxRemain := 32 - t.song.Patch.TotalVoices() + t.song.Patch.Instruments[t.CurrentInstrument].NumVoices
+				if maxRemain < 0 {
+					maxRemain = 0
+				}
+				t.InstrumentVoices.Value = t.song.Patch.Instruments[t.CurrentInstrument].NumVoices
+				numStyle := NumericUpDown(t.Theme, t.InstrumentVoices, 0, maxRemain)
+				gtx.Constraints.Min.Y = gtx.Px(unit.Dp(20))
+				gtx.Constraints.Min.X = gtx.Px(unit.Dp(70))
+				dims := numStyle.Layout(gtx)
+				t.SetInstrumentVoices(t.InstrumentVoices.Value)
+				return dims
+			}),
 			layout.Flexed(1, func(gtx C) D { return layout.Dimensions{Size: gtx.Constraints.Min} }),
 			layout.Rigid(deleteInstrumentBtnStyle.Layout))
 	}
diff --git a/tracker/tracker.go b/tracker/tracker.go
index c53b85e..8f6ec74 100644
--- a/tracker/tracker.go
+++ b/tracker/tracker.go
@@ -31,6 +31,7 @@ type Tracker struct {
 	BPM                   *NumberInput
 	RowsPerPattern        *NumberInput
 	RowsPerBeat           *NumberInput
+	InstrumentVoices      *NumberInput
 	NewTrackBtn           *widget.Clickable
 	NewInstrumentBtn      *widget.Clickable
 	DeleteInstrumentBtn   *widget.Clickable
@@ -166,6 +167,26 @@ func (t *Tracker) ChangeOctave(delta int) bool {
 	return false
 }
 
+func (t *Tracker) SetInstrumentVoices(value int) bool {
+	if value < 1 {
+		value = 1
+	}
+	maxRemain := 32 - t.song.Patch.TotalVoices() + t.song.Patch.Instruments[t.CurrentInstrument].NumVoices
+	if maxRemain < 1 {
+		maxRemain = 1
+	}
+	if value > maxRemain {
+		value = maxRemain
+	}
+	if value != int(t.song.Patch.Instruments[t.CurrentInstrument].NumVoices) {
+		t.SaveUndo()
+		t.song.Patch.Instruments[t.CurrentInstrument].NumVoices = value
+		t.sequencer.SetPatch(t.song.Patch)
+		return true
+	}
+	return false
+}
+
 func (t *Tracker) SetBPM(value int) bool {
 	if value < 1 {
 		value = 1
@@ -383,6 +404,7 @@ func New(audioContext sointu.AudioContext) *Tracker {
 		SongLength:            new(NumberInput),
 		RowsPerPattern:        new(NumberInput),
 		RowsPerBeat:           new(NumberInput),
+		InstrumentVoices:      new(NumberInput),
 		NewTrackBtn:           new(widget.Clickable),
 		NewInstrumentBtn:      new(widget.Clickable),
 		DeleteInstrumentBtn:   new(widget.Clickable),