As gonk suggested (& I had a feeling) the hum was from different things plugged ino different outlets. Between the 2 amps, 2 crossovers, 950, DVD... I ran out of outlets, so I plugged the roku into the outlet the tv was on. Once I moved the roku to the "audio" outlet, hum disappeared. Ground loops really are a hassle.
Anyway all seems to be working now. I "taped" the super bowl & grammys so far. I keep finding MPlayer has the features I like, but "skips" more than the builtin player.

I also put up a prelim PVR web page. It will be growing over time with where I am and +'s, -'s.
I did program the 950 remote to handle the roku. One less remote...
Web page: http://www.stabie-soft.com/ht/roku.html