Thanks for the info guys.
I've built a radio controller for AH using a 1950s UHF aircraft controller, and I can interface it to AH by driving macros from the frequency dials to select different channels.
The only way, I can simulate the man voice channel to off is by the macro selecting a dead channel. (I think)
The suggestion of tuning oneself seems a possibility.
All the best, and thanks again,
Ron (Ronnie)
PS: Hi Bruv!