Cool idea, poor performance – SoundPrism Pro Review

I have an iPhone 6s. The app frequently closes itself for no apparent reason. It seems to happen more often while playing a chord and bass note simultaneously. The control surface lays out an innovative method for playing and writing diatonic harmonies. If the app didn't randomly close all the time (and I mean it constantly happens), I would rate this five stars. Haven't tried this on iPad, but this app's poor functionality cripples its use for me on my iPhone.
Review by 345890348509348 on SoundPrism Pro.