Another idea for improve experience. I was thinking about this at the beginning of this effort and never got around to bringing it up.

The Keyboard/Guitar view as a floating window, and buried in the mixer tabs (never used it), would seem more natural and more integrated into the process if it was a docked horizontal panel at the bottom of the screen..
I am seeing this in several other musical apps.

This has at least four advantages:
1) More room for more keys and streamlines the usage.
2) Can be used as an MIDI input device with on screen chords recognition adding to workflow.
3) Can be used across many of the views as an educational/FYI view.
4) Eliminates the need for the 'piano per track view in the mixer' and enhances the floating keyboard to process input/recognition.

I know you can float a window at the bottom, but this integrates it more with chord input/recognition and output/playback workflow. This does not take away the option to un-dock it.
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(COMMENT: PGM has historically made an easier floating window instead of engineering a docked panel approach. A docked panel approach would greatly modernize the GUI, with relatively a small amount of effort.)

Studio One (latest version), Win 11 23H2 , i9 -10940X 3.3 GHz, 32GB Mem, a 4K 40" monitor, PreSonus Studio Live III Console as interface/controller. secondarily test on Reaper, Cakewalk, and S1 on Surface Pro 3 Win 10 (latest versions).