Several iOS users reported issues with the audio in PBTimer. After weeks of attempted to replicate the issue I was FINALLY able to ascertain the cause and fix it. PBTimer 1.2 should alleviate ALL issues with audio on iOS.
Also, from this point forward ALL paintball apps released by 4Me Labs will be free. Paintball is expensive enough.
For more info about PBTimer please visit: http://4melabs.com/pbtimer/pbtimer-is-now-available-on-ios-and-android/