Total remake the app with training levels

1. Add distortion, reverb, echo sound SFX settings.
2. Add MusicXML support.

bug fixes

Performance Improvement

bug fixes

update for compatibility

update for iPad Pro

iPhone 6 update

iPadAir update

iOS 7 update

Update for iOS 6.0

Bug fix for recording, sound quantity improvement
low volume problem fix

iOs4 update

iPad Support

bug fix