Scroll down to the bottom of this link …
https://cdn.eventideaudio.com/manuals/h90/1.8.6/content/system-menu/global.html
… then reference the list at this link:
https://cdn.eventideaudio.com/manuals/h90/1.8.6/content/appendix/global.html#global-mapping-chart
If you are only using one switch connected to EXP/CTL 1 or 2, a mono TS cable will work. For 2-3 switches, use a TRS stereo cable.
In any case, calibrate your switches, to be on the safe side:
https://cdn.eventideaudio.com/manuals/h90/1.8.6/content/system-menu/io.html
