All applications output audio on the audio device selected in Windows. If FxSound is the default audio device, then browser and Discord output audio through it and FxSound in turn outputs audio on the selected physical device. Since Discord has an option to select audio device in settings you can select a different output device to avoid browser audio and Discord audio to go through the browser. Since browsers don’t have the option to select the audio output device, browser output will always be through the default audio device.
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