WEBSwitch the A20 Transmitter into PC Mode using the mode switch. 2. Plug the Micro USB cable into the A20 Transmitter & a USB port of the Mac. 3. Navigate to Settings, select Sound, then Output and choose Astro A20 Game. 4. Select Input and choose Astro A20 Voice. DAN 1. Skift A20-transmitteren i pc-tilstand ved hjælp af funktionsvælgeren. 2.