At rehearsals, I usually plug my Kemper Profiler Stage into the PA, but with my new band they don't use a PA for vocals, the singer sings straight into a computer audio interface (Scarlett 18i20 third gen) plugged into a couple of (I guess) powered monitor speakers, neither Mac nor PC around.
I admit it struck me, but the point is that it sounds fine. I wouldn’t have expected to use a computer audio interface without computer.
The point is that I plugged my Kemper Profiler Stage L and R XLR Main outputs into the audio interface and it worked, but when the singer connected his microphone in any other Scarlett’s tracks (we tried them all), his voice didn’t sound. If I connected only 1 of the Kemper Stage outputs (L instead of L and R), then his voice sounded. I insist we tried to plug both Kemper and the singer's microphone into all the audio interface tracks.
Maybe some of you have gone through something like this. Any idea why it didn't sound?
If I connected into the Scarlett through one single Kemper Output (L), is it correct? And if it's correct, then maybe should I switch to Master Mono? If I did that, should I check the stereo based effects like delays or they’ll just go Mono without any other snag?
Maybe should I connect through Monitor output instead of Master output?
Thanks in advance and sorry if any of these questions is naive