Yes to DPL II.
The only mode I ever used much in the past was Dolby 3, which I guess is just generating a center channel from stereo. However, I now wouldn't use such a mode unless I had identical speakers across the front. I've also used some Fosgate modes like Rock but those actually involved putting some front channel info into one of the surrounds, not just reverb. Since Fosgate designed DPL II, I figure whatever modes came with that are all I'm going to fool around with.