Hello There!
I have recently made a metronome app and it is completely AD-FREE! Use this app to provide beats. Here's the link to the app : http://ai2.appinventor.mit.edu/?galleryId=5366842799816704
Thanks to @TIMAI2 to help me find a reliable ticking sound.
See here:
hey my friend, how could you connect your application to a bluetooth module hc06?
I am prwtty sure we can but that would require some more coding to do. My expertise isn't really in that field so I can't help ya... create a postor read others' to knoq how that works.