Ok, I found the hum (it was more of a hum than a buzz). Upon a closer inspection of the switch pcb, I feared I may have tanked it due to the repeated soldering/de soldering, so l started over with a fresh board and switch. The sound improved greatly, but there was still a little amount left. Unplugged the headphones, and wallah...nice clean sound (note, I'm an insomniac, so the Mrs was a *tad* miffed to hear Bass, even softy, at 12:30am

).
Being anal, l first wired to two jacks together straight, then added the switch, one side at a time (by-pass, the out to the "circuit"), to eliminate all variables.
Hey the whole point of this is to learn, and l have learned something.