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So I have used a 3.5mm splitter with passive volume control to connect speakers had headphones to a computer, so this rca line level volume control with RCA-ins-and-outs may work like the PC38x volume knob and may even work for you by buying it as well:
https://www.ebay.com/itm/324996076741?hash=item4bab4694c5:g:eMsAAOSweVVh4Y6C
https://www.ebay.com/itm/324996076741?hash=item4bab4694c5:g:eMsAAOSweVVh4Y6C