Bluetooth headphones + music playback issues
If you're listening to music with bluetooth headphones and the audio quality sounds poor, it's probably because your bluetooth headphones are in "call mode." In call mode, your headphones are optimized for conversation as opposed to listening to music so music sounds pretty compressed and terrible.
To fix this, simply adjust your Tandem audio input settings (or you can do this at the system level) so that your mic is different from your bluetooth headphones. Often the simplest option is to use your build-in laptop mic. That frees your bluetooth headphones to disconnect from call mode and playback music at optimal sound quality.
Mic bleeding (in Music Rooms)
This is specific to Tandem's Music rooms which use Spotify's API to synchronize the Spotify apps on each of your teammates' computers.
Because we use Spotify's API, music isn't being streamed from the DJ's computer to the other computers in the room. However, if one of your teammates aren't using headphones and their mic is active, the music coming out from their speakers COULD be streamed to your computer which would cause you to hear the music twice.
The solution here is to make sure that your teammate either has their mic turned off or uses headphones to listen to music.