You must setup a Push-To-Talk (PTT) button. And, you need to select the correct radio before you transmit. I use simple communications, so I set VoiceAttack to always listen. I have a button mapped to 2. Which is the radio I set in the Viacom control panel. So, when I press the button it transmits on radio 2 and I get a response. Combined with DCLeap for hand & finger recognition, I get totally immersed.