In iOS 5 devices, new notes are recorded with a volume of 9, which is greater than the maximum CMI volume of 8. In iOS 6 these notes play at 8, but in iOS 5 devices they are rejected by Core Audio.
There are two possible workarounds:
– edit every new note;
– use an external music keyboard to record notes.
This bug is fixed in release 1.5.3.
Posted in: Bugs Fixed in 1.5 to 1.6