– MIDI keyboard and Maschine with CV.OCD. (There are 12 gate outputs, and I keep 5 assigned to specific notes on MIDI channel 10 so it’s easy to sequence or play them with drum pads).
– Soundmachines LS-1 Lightstrip has a gate output as well as CV.
– Ladik P-075 Dual Switch. Has two channels of passive switches, each of which has a toggle switch and a momentary switch that inverts the toggle switch logic.
– The B mod bus on Double Helix has a toggle switch.
– Contact mic or Jackalope into Schmitt trigger in Hemisphere.
I haven’t seriously used these, but they would work:
– A Shades or A-138m channel with its knob set to 12 o’clock; flip the switch between bipolar and unipolar to switch between 0V and a positive voltage.
– Frap Tools 321 has a tiny switch for each offset knob which could be used awkwardly for gates.
– Livestock Maze with a constant DC input, flip between on/off states on various outputs with button presses.
– Something to generate a manual CV offset, into a comparator.
– In Teletype, set M! 2 and then use TR 1 GT PARAM 50 for the M script.
– Mimetic Digitalis: set the voltage of a channel high on the second step and use the Origin button to disable, X to enable.
– Bin Seq; set the first gate on, hit Adv once to enable, Adv again to disable but you need to hit reset afterward.
– Manis Iteritas: set env time to minimum, tap the Hit button, use output as a trigger.