I use the SLUSB along with an IC-7000 -- however, I DO use the 6-pin data cable.
From my understanding, using the 13-pin ACC cable -- you are correct in the mic does NOT mute. Leave the mic gain alone, and when you want to work digital, simply unplug the mic.
Just did a search for the pinout for the 6-pin mini DIN to the RJ-45 -- I'd imagine that it'd be pretty simple to make. The 6-pin mini DIN is the same as a old PS/2 keyboard or mouse. But alas, I could not locate the pinout.
Unplugging the mic is the "quick and dirty" way of handling it, though.
Good luck!
--Alex / KF4YOR
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