Crashes and doesnt work

One of the new iOS updates mustve messed with it because it doesnt work on my iPhone 6 anymore. This was my FAVORITE app for recording! But now when I open it, it doesnt work at all. Touching the screen or pressing a button? Crashes. I even whistled because the tuner opens by default and it crashed from that (I also went to the extreme of varying my whistle volume and making it softer and softer and it still crashed each time). Please fix this app!

AJrockstar about Musician's Kit - Tuner, Metronome, and Sound Recorder