Lack of instructions limits the usefulness

I am using this app to learn several songs (drums) including In my time of dying (From physical graphiti)

I want to save several sections of this song and work these parts individually.

I was looking for your quick start guide and sent an email from the app with no response

So is the not app to channel my inner John Henry Bonham

ChaWha about AudioScrub (PLAY Edition), v2.6.5