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Is there software that would let me automatically switch between microphones on my computer when I put on my headset?
I imagine this might work as a piece of software that integrates all microphones connected to my computer into a single input device, then transmits the audio stream from the best-quality source.
A partial solution would be something that automatically switches to the headset microphone when I switch to the headset speakers.
Depending on connection method for your headset, you might be able to just use a simple switch. Mine is USB, and https://smile.amazon.com/dp/B00JX1ZS5O lets me just leave it disconnected when not in use. My Windows box uses the speakers when it's disconnected (I don't have a separate mic, but I expect it would work the same), and switches output and input to the headset when connected. I've seen similar switchers for 3.5mm audio connectors - I have no doubt they'd work for microphone instead of speaker, but I don't know any that combine them.
Thanks. I tried a couple different switches on my setup (3.5mm through USB-C hub), and the computer didn't disconnect upon opening the switch, so I'm giving up on this until I change hardware.