A company named MIDI SOLUTIONS (and other companies) make MIDI TO GPI converters.
Choose ANY midi app on windows, ios, android, etc with the UI best suited to your needs.
For instance, your midi app may have an image of a drum set to play drums.
You super easily map midi notes to each drum. Each time you tap a drum it sends a midi notes to the converter. Acuity recieves the GPI then does something.
I have used this setup for years triggering a SONY MVS 8000. Many many MIDI apps are free.
Triggering switcher macros with my phone was always fun. You can even use midi cabled UI if you dont trust wireless.
Hope this helps.
#Acuity