Okay... this is a weird one. I was about to use ReaFir on a track & I looped the hiss & noticed that the Metronome was faintly playing back.  I looked at the Metronome settings page & it's output was set to Metronome. I looked at the Metronome Bus & the output was set to Master. I changed the output on the Bus to my Audio Interface's Output & recorded another clip & it was still there. I went & changed the output in Metronome settings to my Audio Interface's Output &a