Some decent ideas in there.
Though, you might wanna switch to quick hand sketches, rather than put so much time and effort into proposals that might be dismissed or maybe go unnoticed.
I’d put Delay and Reverb together with Chorus, Phaser, etc… and call that panel ‘Effects’, as that’s how they’re more generally referred to in music production.
Add Tremolo and Vibrato (both with dedicated depth and rate sub-controls) for good measure. Maybe even throw in bot crush. Maybe Stereo Width* too.
In the two slots freed up by moving Delay and Reverb, I’d suggest Tune and Offset (as we have for Imports), which would give us access to some extra sound design tricks.
As for the Pluck, etc… presets…
I’d much rather see them put effort into getting some user-controllable ADSR, rather than limit users to their idea of preset envelopes.
Sound design benefits from much more variability than preset envelopes tend to offer. Some users might want something very specific, that’s halfway between pluck and pad, for instance.
Presets would be only a partial solution, a band-aid, unlikely to give many users the control they want. If it’s possible to create Pluck, Pad, etc… versions of sounds, surely it’s possible to make those ADSR dials available to users.
It’s frustrating that Auxy is only three or four (particular) major features (and a handful of smaller features) away from being the ideal distillation of power and UI on the mobile platform - and a genuine option for semi/pro music producers, imo.