Yes, mapping a HotSwitch to an external footswitch will make it so the footswitch activates the HotSwitch. Pressing the footswitch again will deactivate the HotSwitch.
Any parameter can be mapped to a controller. Press and hold the parameter to enter the mapping menu, and assign the control source to whatever you’d like to use. You can also use the “Learn” function – https://cdn.eventideaudio.com/manuals/h90/1.3.0/content/edit-modes/parameters.html#mapping
