The only solution is to update to iOS 9. By the way, Apple included important audio related bug fixes in iOS 9.3 that developers had been waiting for a long time, and with iOS 11.3 they fixed a few more. With iOS 6/7/8 it was a different story, but since iOS 9.3 we recommend the latest iOS version if you use audio apps.
Right, we’ll probably increase the minimum iOS requirement to iOS 9.3 with the next update or the one after.