HI,
You can create a notification with option AutoCancel (dismiss the notification if the user touches it).
There's SetOnNotify (presumably invoked when the user touches the notification)
You could try sending a notification(tile "Play", perhaps an image),
when the user touches it then play music and send another notify (title "Pause", perhaps an image),
when they touch that then pause music and send another notify (title "Play").
If that works then you could have more notify's (prev,next,etc)
"If you use more than one notification, app.GetNotifyId can be used to check which notification was pressed by the user."