Hi Sean,
It’s really difficult to answer this remotely as everything depends on your specific equipment and setup. I’m guessing that PilotAware simply isn’t producing a sufficient audio level to overcome the threshold set by your ANR. This could be resolved by using a pre-amplifier, but you can only tell by trying it.
With regard to the 3/4-pole plugs, both versions of PilotAware use the standard Raspberry Pi 4-pole TRRS (Tip/Ring/Ring/Sleeve) output jack, with a common MONO audio output from PilotAware on both the left and right Raspberry Pi audio channels, see here...
https://www.raspberrypi-spy.co.uk/2014/07/raspberry-pi-model-b-3-5mm-audiovideo-jack/Most systems work fine with a 3-pole TRS cable which effectively ‘short circuits’ the unused (by PilotAware) Raspberry Pi ‘Video’ Channel to Ground, (with no apparent consequences), and presents an identical (Mono) audio signal from PilotAware to both left and right channels of a stereo intercom, but in some systems this just doesn’t work due to the design of those specific units. I, for example, use a Flycom intercom, which has a single mono RCA audio input, so had to make up my own lead to match by adapting a 4-pole ‘TRRS’ cable.
Regards
Peter