How to prevent my Steam from messing with my outside audio?

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Imagine me, sitting there at my computer watching a YouTube video. While I am sitting there, a friend of me messages me. Steam, trying to be the considerate person, lowers the volume of my video. I reach over to the volume slider, and move it back up. Seconds later though, as my friend messages me, Steam pulls the slider back down to a lower level. I tried looking around in the settings, but there was nothing about prevent it from altering my audio. Is there a way, and if so, how?
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Quick Answer about "How to prevent my Steam from messing with my outside audio?"
How do I change my audio output device on Steam?
Steam Audio is a cross-platform software toolkit for spatial audio. You can use it to add rich, immersive positional and environmental audio effects to games and VR/AR apps. Steam Audio offers a wide variety of features, including: Render 3D positional audio.What is Stram audio?
To open these settings, open your Friends & Chat in the bottom right of the Steam client and selecting the gear icon in the upper right. - from here you can use the button "Start Microphone Test" to test your mic settings (expect echoes if you don't have earphones!) If it works, go ahead and test it in-game.How do I enable my mic on Steam?
Our Steam games use the Windows default audio device to output audio. If you cannot hear in-game audio (even if you still get audio for other programs), your audio output device may not be set to default. Your default device will have a green check.How To Fix Steam Games Have No Sound
Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: Katerina Holmes, Laura Tancredi, Brett Sayles, Brett Sayles