make method to get data out of a module

internal/module/midi-output.go

@@ -98,3 +98,12 @@ func (mo *MIDIOutput) Output(ctx context.Context, payload any) error {
 func (mo *MIDIOutput) Stop() {
 	mo.cancel()
 }
+
+func (mo *MIDIOutput) Get(key string) (any, error) {
+	switch key {
+	case "port":
+		return mo.Port, nil
+	default:
+		return nil, errors.New("midi.output key not found")
+	}
+}