I really liked the premise, me being a hobbyist guitarist, I really appreciate all things sound and pitch related. The true to life sound wave representation, the beat generation with two closely matched frequencies and the audio were really cool (my first 5 star audio rating btw).
A few gripes:
1. The dials rapid sped up if moved even remotely quickly. If that's intentional, I feel like the dial values shouldn't have been so close to the value it should be set to. There should've been a lot of moments, where the player would've had to rapidly rotate the dial to come close to the value and then fine tune it.
2. The gameplay got a bit repetitive towards the end.