Per MIDI channel Mono ST+FP MPE mode, or guitar mode

[j5v]

Is your feature request related to a problem? Please describe!
I want to emulate a stringed instrument, using MPE, where each string is mono legato (ST+FP) mode.

Describe the solution you'd like:
Play Modes that suport "per MIDI channel mono mode, or guitar mode"

Describe alternatives you've considered:
I can work around this by setting up parallel instances of Surge, and run then in Mono ST+FP mode.
In my case, it doesn't matter that each signal is processed separately in the FX of each instance, but I can imagine someone wanting to drive multiple voices into distortion FX.

Additional context:
Discussed in Discord, along with potential UI modifications for Surge XT 2.
https://discord.com/channels/744319641211633774/749603338630201344/1465445316110319628

[mkruselj]

The voicing menu would have these options:

Poly
Mono
Legato
Mono Guitar
Legato Guitar

If MPE is enabled, Guitar modes are grayed out and are reverted to their non-Guitar variants. The little legato arc button in top right of Glide knob is the "fingered portamento" mode (also sometimes referred to as auto-glide in some synthesizers).