I've noticed that the performance of prologic II on my Onkyo sr600 receiver varies widely depending on input. When playing cable TV audio (stereo content) most of the sound comes out of the center channel, with the fronts outputting less and with low volume, and the surrounds outputting even less at an even lower volume. So, most of the time I use the "TV" mode setting instead pf plII when watching TV. Note, that this is with stereo content, not mono which only comes out of center speaker as expected. However, when I play a DVD with stereo content, it sounds great with good surround sound simulation. I haven't tried to play a VHS in a long time. Has anyone else had similar experiences? Do you think it's a digital vrs analog input issue? Or perhaps specific to cable TV?