Ok, so I just went out and purchased my first Preamp. I've always milked everything out of the pretty decent preamp built into my 18i20 focusrite audio interface, but I realized it was time for something new. I bought the ISA one focusrite pre and the preamp offers more subtle definition, much finer control over gain levels, different impedances including one of the most famous and well regarded Rupert Neve amps. This is all great, and I'm enjoying it all, but, I'm getting a noticeable (but subtle) and unpleasant distortion to certain takes that doesn't correlate to actual clipping. The mic being used was the Lewitt Lct 540 and at normal gain levels with the preamp, I'm getting slight distortion in certain phrases. I know it's not true distortion because when I wail into the mic, it doesn't distort. It seems to be almost completely random. I understand that I may just be riding the gain too hard, but I still hear this even when I take the gain so low the needle doesn't move and I barely have a signal. I'm sure this user error because when I dial the gain back there's still this issue but it's much much less noticible. I tried different impedances and making sure the compression in my DAW wasn't affecting this. I just don't know what to do. Help please!! Thank you!!!