I have some great piano instructional books that came with CDs. I've ripped these CDs onto my iPad, and now I want to follow the sheet music and listen to the demos.

I'd like an app to 1) slow the song down so I can more easily follow the passage and 2) mute the left/right channel. These CDs have the left hand coming through the left side and the right hand coming through the right side.

I've seen apps that slow the music down, but I can't tell if they allow you to mute a channel.

Thanks in advance!