This may be obvious but it just occurred to me now that Photomatic controls on track 16 can be controlled by external MIDI… I was tired of having only the 16 steps for Parameter locks on brightness, contrast, etc but with external control this isn’t longer a limitation. I MIDI CC-mapped outputs from a couple of virtual Befaco Rampage Modules in miRack/VCV rack to the Photomatic MIDI CCs and now enjoy infinite modulation complexity for my visuals, woohoo!
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Great to know! Ty for the insight!
Would you mind sharing a miRack patch to try out? 
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Here you go:
You just need to select the op-z as a midi device in the two midi modules. The one on the top left just controls the clock with the op-z play/stop buttons. Btw, If anyone knows how to wire the op-z midi clock bpm to miRack without another host app, let me know…
Rampage outs range from 0 to 10 volts, this will be converted to midi values 0-127, then in the op-z app to 0-100 parameter value… somewhere along this path it gets a bit jaggy and sometimes jumps values. I have yet to try this setup in VCV rack…
btw, the same works for the Light track on MIDI Channel 15, wohoo!
Wow thank you! I’ll try it out and reply