Keep in mind that the master output potentiometer on DN/DT (and probably Minilogue) are attenuators. That means that the level on max is the unity gain level from the opamps after the D/A converter. So with the volume pot at max you should have the best signal/noise ratio. However the inputs in the DT/DN can attenuate they have plentora of additional gain for weak levels because there’s a pre amp there. I won’t recommend to amplify a signal that doesn’t need amplification (except in analog domains where you want saturation/clipping or overdrive) but instread to bring the signal down within the input mixer settings of the DT/DN so it matches the overall volume of the internally summed mix. In practice that means the input level setting is going to be set low with line level equipment otherwise you end up eating all internal headroom.