feat: midi note input for the tracker

tracker/processor.go

@@ -0,0 +1,20 @@
+package tracker
+
+import (
+	"github.com/vsariola/sointu"
+)
+
+type Processor struct {
+	*Player
+	playerProcessContext PlayerProcessContext
+	uiProcessor          EventProcessor
+}
+
+func NewProcessor(player *Player, context PlayerProcessContext, uiProcessor EventProcessor) *Processor {
+	return &Processor{player, context, uiProcessor}
+}
+
+func (p *Processor) ReadAudio(buf sointu.AudioBuffer) error {
+	p.Player.Process(buf, p.playerProcessContext, p.uiProcessor)
+	return nil
+}