What are the full midi control capabilities of mt32-pi

[chrisdswift]

I am building a controller to turn the mt32-pi into a standalone multitimbral synth using a Teensy 4.1 with USB Host for USB midi in, serial midi in, a separate OLED display (separate from mt32-pi), 1 or more rotary encoders and/or buttons, serial midi out to mt32-pi. The display will show voices, channel volumes, channel pan etc for up to 8 channels at a time. I have already built one of these for the excellent Dreamblaster X2 from Serdashop (https://www.serdashop.com/DreamBlasterX2. My questions are:-

1. Is there a sysex command to change master volume?
2. If I retain the display attached to the pi, will it be updated if I send sysex commands for switching rom set, switching sound font and switch synthesiser? If not, I will remove the original display.
3. Is there a list of common commands recognised by mt32-rpi?

Thanks for any input