I'm noticing an issue with voice comms while in the airbus 320.m (Both the default and the flybywire mod)
When you tune in, you might get a split second of audio but then it cuts off. You can't broadcast or hear anything...
But a work around I found mostly works is...
In the in-game ATC, open the COM2 tab. Then in the cockpit, click the first CALL (COM1) button. That gets the radio working....