In release 1.1.11, when you tap the edit button on an instrument voice in Page 3, the App quits. This applies to the Pro and non-Pro Apps, but apparently not to the non-Pro App if it has been upgraded to Pro.
This bug is fixed in release 1.1.12, which we hope will be approved by mid-January.
Posted in: Bugs Fixed in 1.5 to 1.6