I'm using a Numark Scratch and whenever I set a channel on the mixer to line/phono (which changes the channel in Serato to Thru) I am no longer able to control the audio in OBS with the mixer. The audio from the turntable will just be a constant volume in OBS and the faders and knobs will not make the volume louder or more quiet. When the channels are in PC mode on the mixer and using Serato DVS then everything is fine. I can control the volume in OBS. So essentially I cannot stream a vinyl DJ set with two turntables and the Scratch mixer because I am unable to turn the volume down for either of the turntables in OBS to cue up a track. Any advice?