how to active audio source

hi there - I've been trying to figure this out on my own for a good while now, but to no avail - I'm trying to set things up so that I can have background music playing on a recording, along with a Minecraft and my own Microphone. I've managed to split the audio into multiple channels, where...

I have just purchase the Vocaster two audio USB interface and using with OBS Studio. Got it setup yesterday, all worked great. Today I open it, and my vocaster is no longer showing in the audio mixer. I tried " unhide" and that did nothing. I check the audio mixer advanced settings and it shows...