move device value struct to specific file

core/music/device_value.go

@@ -0,0 +1,25 @@
+package music
+
+import (
+	"signls/midi"
+)
+
+type DeviceValue struct {
+	Device     midi.Device
+	GridDevice *midi.Device
+	Enabled    bool
+}
+
+func (d DeviceValue) Get() int {
+	if d.Enabled {
+		return d.Device.ID
+	}
+	return d.GridDevice.ID
+}
+
+func (d DeviceValue) Name() string {
+	if d.Enabled {
+		return d.Device.Name
+	}
+	return ""
+}

core/music/note.go

@@ -29,26 +29,6 @@ const (
 
 var lastUsedChannel uint8 = defaultChannel
 
-type DeviceValue struct {
-	Device     midi.Device
-	GridDevice *midi.Device
-	Enabled    bool
-}
-
-func (d DeviceValue) Get() int {
-	if d.Enabled {
-		return d.Device.ID
-	}
-	return d.GridDevice.ID
-}
-
-func (d DeviceValue) Name() string {
-	if d.Enabled {
-		return d.Device.Name
-	}
-	return ""
-}
-
 // Note represents a midi note.
 type Note struct {
 	midi midi.Midi