I wonder if anyone else has experienced this with Involve's Surround Master. To set the record straight, I'm a extremely fussy music listener .............I own both the original & a V2 which I use both on 2 separate systems, The SQ mode is GREAT for all the 70's SQ stuff. The problem I'm having is with the "involve" mode. For TV it's excellent, for stuff encoded in RM or QS it's excellent, but with stereo music, I hear a lot of "pumping" going on, mostly with the center & front left channels. If I switch from 5.1 to 4.1, the pumping is diminished, but still some. A lot of songs sound fine but SOME display this slightly distorted, pumping thing in the channel's I've mentioned. The best example I can think of is Elton John's "Someone saved my life tonight". You really hear it when you isolate those channels (turn all others down & just listen to one) It does it in BOTH of my systems, on the same songs, so I don't think I have anything hooked up improperly. .....Has anyone noticed or experienced this ?? .......... Any suggestions ? (I don't use the RCA cables that came with the units, could that be it ?) ...... Like I mentioned, I absolutely LOVE what it does with the 70's quad formats (SQ, RM, QS etc), but when playing straight stereo recordings using the involve mode, the separation is great, but this issue really dampens my enthusiasm.