So i assumed when reading specs "Line Input" meant that i could run for examlpe a tablet sound output (analog) into one of the input of eg my UMC1820. But it didnt seem to work, the sound is all garbled on inputs 1 & 2 , while when plugged into input >= 3 it sounds ok but the volume knobs on those inputs have no effect, but it is effected by volume knob 1 & 2 ??
AFAIK this sort of thing is done with 3rd party PC software, there really isn't much to be configured internally in the device. I just bought this model too, so am new, but it comes with a copy of tracktion waveform which has routing.