Make it compatible with Multitracks

I use multitracks to play in the band, the tempo is there but it would be great to linked the multitrack when is played with the Meteonome App to launch automatically when multitrack is launched. Multitracks company has an App called Playback to play the multitracks if any API could be developed to link this kind of Apps will be great!

Merged into "App: Better integration with the Playback app from Multitracks" #145