AT, I change nothing between track 2 (no hum) and track 3 (hum). But rharv may have a point. It is cold here these days and I may not have heard the furnace. The home owner says he gets this hum in the past with his system and has never figured out where it originates. In fact when I was helping him set things up, he did have a "black box gizmo" which he plugged a bunch of cables into which was intened to shield the signals. I removed it feeling it was not needed for a home studio setup and just added unnecessary complexity. And all work well a couple weeks ago when we recorded Segments 1 thru 13 of his project. But this time, from out of no where the hum returned.

BTW, I would love to tell you guys the full back story about this project... but that would take a huge posting which would need its own thread.

BIAB – 2025, Reaper (current), i7-12700F Processor, 32GB DDR4-3200MHz RAM, Motu Audio Express 6x6 - My SoundCloud (Tip: No need to create a SC account to hear music - just hit ESC ).