Eu resolvi o problema usando o IndieVolume , que me permite selecionar um dispositivo de saída de som diferente para cada aplicativo. Dessa forma, posso usar o Chrome para navegação e o Firefox para música.
IndieVolume makes Windows programs use separate volume controls independent of other Windows programs.
Bespoke per-application volume, IndieVolume can also make Windows programs shut when GPS speaks, boost too silent sound, propagate sounds to multiple rooms in your apartment and many more.
Two or more soundcards, but applications play only on one.
For example, if you have built-in sound card and SoundBlaster as second sound card, or USB/Bluetooth headset, you can configure certain applications play on built-in sound card, and others play on SoundBlaster or USB headset, fully employing your audio hardware.