diff --git a/patch.go b/patch.go
index f9b7cd2..a8db243 100644
--- a/patch.go
+++ b/patch.go
@@ -422,7 +422,11 @@ func (p Patch) FirstVoiceForInstrument(instrIndex int) int {
 		return 0
 	}
 	instrIndex = min(instrIndex, len(p))
-	return TotalVoices(p[:instrIndex])
+	ret := 0
+	for i := 0; i < instrIndex; i++ {
+		ret += p[i].NumVoices
+	}
+	return ret
 }
 
 // InstrumentForVoice returns the instrument number for the given voice index.
diff --git a/song.go b/song.go
index d89f0fc..ab1ad95 100644
--- a/song.go
+++ b/song.go
@@ -275,7 +275,11 @@ func (l Score) FirstVoiceForTrack(track int) int {
 		return 0
 	}
 	track = min(track, len(l.Tracks))
-	return TotalVoices(l.Tracks[:track])
+	ret := 0
+	for i := 0; i < track; i++ {
+		ret += l.Tracks[i].NumVoices
+	}
+	return ret
 }
 
 // LengthInRows returns just RowsPerPattern * Length, as the length is the