I hate skeuomorphism in general. But this, I love.

It would only be a problem, in my opinion, if you had added a rotary knob. Those accursed, misguided designers who drop rotary knobs into a user interface *where there is no way to turn a knob* draw my ire. Audio plugins - you know who you are. At least make it a slider, people. That, I can drag, with mouse or touch.

Will definitely check this app out. Thanks for the excellent writeup.