Slick presentation and clever idea! Design-wise it would've been nice to have a few more easier levels to help ramp up to the more challenging ones, and/or some kind of open practice room where you can mess with all the parameters and get a feel for them.
The one bit of polish I would really like would be to let the player twist the knobs using the mousewheel, like in a DAW. Other than that this was a cool take on the theme!