Nice picture, looks intuitive
I got an idea on how to manage more effects.
1. The "Reverb"-button should be replaced by a simple button named "FX", shaped like the "mute"-button
2. When the user touches his finger onto it and holds it, a new window appears on the left half screen providing 4 vertically aligned effect-bars (maybe reverb, delay, bit quantize and stutter)
3. every effect-bar should consist from left to right of
- a red off-button, shaped like the "REC"-button in the main-screen and
- a fx-depth-setting- and time-bar in size of the waveform-field of the main-screen
- cartesian coordinate-style
The functionality is given in the way the user touches the FX-button and slides his finger to the section he wants an effect to get changed.
After untouching, the effect-screen closes and saves the position the finger moved to, so that the effect-changes instantly will apply to the track.
In my boredom of the evening I even put together a graphic:

I hope you understand what I mean
Thanks for developing this great thing, I totally appreciate it