the Toshiba modules are active opto coupler, a high intensity LED coupled with a sort of an Solar Cell. They voltage ripple output is depended on the DC input, the nice way that you do not need a DC/DC switching converter that creates switching noise and need filter counter measurements in the audio tree....
The same elements are great for a passive sidechain for a push/push compressor, you just drive them with a buffer resistor of the audio signal and you get enough voltage to direct drive remote cut of tubes....
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