If I had it to do over, I would not buy this app.

I bought this expensive "pro" app thinking I could use it as a portable way to review my multiple-track music mixes.
I was wrong... it will only import ONE track.
as it currently is, THIS APP WILL NOT PLAY MORE THAN ONE IMPORTED TRACK.

so if you are looking at ProStudio as a way of listening to your own multitrack mixes, Id recommend you try another app.

Rebop3 about ProStudio - Music Recording App, v1.3