Place your microphone on a stand or mount. If you’re using mic without a good stand (like your phone), this can help prevent it from picking up vibrations from your desk. Upgrade your microphone. Switching from something like a laptop’s built-in microphone to a dedicated USB mic can make a significant difference in streaming quality. Research your microphone’s pickup pattern. Microphones have different pickup patterns, which are the directions that the mic best picks up sound from. For example, the cardioid pattern picks up the most sound from directly in front of the mic, and nearly none from behind it.
Increase the audio quality from the music streaming source. Upgrade the speakers you’re using to play music. Potentially play your music from a record player for higher quality sound.
The Stereo Mix option is only available if your sound card and audio driver support it.
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Your streaming software may not support multiple mic input channels, meaning that you can only play computer audio or voice audio, not both. You can use a software with audio mixing such as Open Broadcast Software (OBS) to create an audio channel with both computer sound and microphone input. If you want to get really advanced, you could try using a physical sound mixer.