Optocoupler for p-ch JFET attenuator?

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As shown in the attached schematic fragment, H5 is a control signal from an Arduino that is supposed to control the "mute" circuit. I'm wondering if it would be a bad idea to connect the uC's ground here. Or perhaps I should replace the transistor with a optocoupler. I want to reduce, if not, eliminate the possibility of feed-through. What should I do here?
 

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