Discord Setup
Discord is the most common group chat app used in Condor competitions. It can be used in a web browser but it is recommended you download the windows applications so you can use additional features like push-to-talk.
Push-to-talk
As to avoid disturbing others with your ramblings or expletives to yourself while flying it is requested by most servers that you setup push-to-talk in Discord. Discord does have a voice activity option but in practice it does not work as well as desired. To setup push-to-talk, you need to enter the User-Settings. It is usually found in the bottom left of the Discord window next to your username and the mute and deafen buttons. Then select 'Voice & Video' from the left hand menu. Select the 'Push-to-talk' radio button and choose a key or joystick button to use for opening the mic.
Input Devices
Ensure your input and output devices are set to the microphone and speaker/headphones you are using for Condor. If you are having problems with transmitting or receiving in Discord, this should be the first place to look.