You could send each audio device (including OBS monitoring itself) into your mixer app, then set Zoom to use your mixer app as its microphone. They should stay in sync enough, even going through different routes. If you don't need to stream or record it using OBS, you can use something like a Voicemeeter mixer app, and just use OBS for the video. The second one: There are good non-OBS options for making your audio mix. I know you can do something similar using the default 'Desktop Audio' and 'Microphone' sources, but I haven't actually gotten into those, since I like controlling which exact devices I'm using, and I believe those bind themselves to whatever your computer considers Default. You should be able to adjust the relative volumes in OBS, and even add effects. You then set your Monitor Device for OBS to the Virtual Audio Cable Input, and your Zoom to the Virtual Cable Output. Otherwise they would be set to go out to a stream or a recording but not be audible to you.ģ.

You want to make sure both of these new sources are set up to Monitor, under Advanced. If you have sound coming out of your piano through cables into inputs, then that's another Input Capture, like your mic.Ģ. I believe your mic is an Input Capture, and your piano is an Output Capture, assuming you have an application that is playing the sound you would want to capture the output of that application.

Set up each of your devices (piano, voice) as a Source in OBS.

If this is true, then two methods come to mind:ġ. If I'm understanding this correctly, you just want to send multiple devices to Zoom? You aren't (in this case) livestreaming or using OBS for anything fancier than to make your webcam look good?

Virtual audio cable streamlabs obs