I have been trying to record my parts to a collaborative music project with GarageBand - I am playing bass ane singing. I, if at all possible, want to avoid doing these two things seperately. So, I have armed my two tracks for recording and am monitoring both; my interfece is a Behringer U-Phoria UMC202HD. Bass plugged into channel one and mic into channel two. However, playing the bass not only comes through on channel one but the signal bleeds into channel 2, interrupting my vocal track. There's no way the bass is loud enough to be heard this clearly and it sounds like the DI track from chanel one. Anyone have any idea what causes this very stressful issue and how to solve it?

Hi - You might accidentally be recording in stereo from both inputs on the mic channel -- that would result in both mic & bass signal getting recorded on that track. Hit "B" to open the Smart Controls panel and check the input setting as shown in the screenshot below -- make sure the input to the mic channel only comes from input 2..

I tried that one, even deselected inputs altogether and reselected them again. The vocal track was definitely linked only to input 2 into which my microphone was plugged.

Hmm.. I don't want to offend you with a really obvious suggestion, but since I don't know what your level of expertise is.. You don't have the bass sound coming through speakers in the room while you're recording, which would be picked up by the mic? If that's not the case, is there any routing option within the Behringer that could cross-feed a signal from one channel into the other? Does the Behringer come with a software routing utility that could potentially affect that?

Hey mate, no I don't believe it does and if it did I certainly haven't used it. Someone did suggest I toggle the "direct monitoring" button but I'm not sure what effect this would have.

In theory that setting should only have an effect if you were monitoring through speakers while recording -- if you're monitoring in headphones while recording it shouldn't make a difference...but of course it couldn't hurt to try it.. If it doesn't appear to be a procedural issue, then the usual troubleshooting steps would normally be the next thing.. - Computer shutdown/restart - Try the same setup in a different GB Project - Try with a different instrument..? - Try reversing the channels and see if it still happens - If possible, try the same thing with a different interface - If possible, try the same thing with a different DAW