I've routed around that problem with several RCA-to-Stereo plugs for "when in a pinch" (and their natural reverse, the "stereo-to-RCA") but am still stymied som

I've routed around that problem with several RCA-to-Stereo plugs for "when in a pinch" (and their natural reverse, the "stereo-to-RCA") but am still stymied sometimes by the difference between the different 2.5mm and 3.5mm spacings for microphone support. Supposedly I must keep an eye out for "a TRRS-to-dual-TRS splitter cable to fork the signals into their respective ports"... Tip/Ring/Ring/Sleeve, who knew??!?