I have a bunch that use audio coupling, but none that use optical coupling. An example is this: https://www.ericasynths.lv/triggergen/ https://www.ericasynths.

I have a bunch that use audio coupling, but none that use optical coupling. An example is this: https://www.ericasynths.lv/triggergen/ https://www.ericasynths.lv/triggergen/