per the instal man...
... section 2.5.2 says to use the PAR com as comm2 and section 2.6.2 discusses the "Swap Mode" via a switch through pin 20, J2 (using aircraft ground). My interpretation is that it will swap between the active freqs of comm1 and comm2 only. So Bob, in your case, comm1 = GTN and comm2 = the PAR radio (M760REM).
Sounds like you want an active/stby flip-flop? Don't think it'll do that. I could be wrong though.
I'm doing similar work, except putting the swap button inside the throttle handle, so the switch will be thumb activated.
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RV-8 KFYE
Memphis, TN
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