Unsound,
An optocoupler/optoisolator is basically a LED and a photosensor in close proximity. One part of the signal lights the LED which shines on the photosensor to operate another part of the circuit. Almost always (dare I say always) these appear to be just some other IC looking device.
In many instances they are used to isolate an input or output circuit from the more delicate "inner workings" although that does not sound like the purpose in the Stasis circuit.
An optocoupler/optoisolator is basically a LED and a photosensor in close proximity. One part of the signal lights the LED which shines on the photosensor to operate another part of the circuit. Almost always (dare I say always) these appear to be just some other IC looking device.
In many instances they are used to isolate an input or output circuit from the more delicate "inner workings" although that does not sound like the purpose in the Stasis circuit.