I know this has been commented on a few times but I'm going to say it anyway... A few posts back someone mentioned Miki's World on the 3650 using poly OTT's for the in-game audio (deducted from disassembling and general poking around). I also remember reading this:
It's Darude Highway Racer featuring poly sound... for Series 40 phones (and I haven't seen any that support the MMAPI).
I haven't seen the OTT file format (a link, anyone?) so I haven't looked into the first point. I also haven't seen Darude Highway Racer, so I can't comment on that. Anyone able to shed any light or have any other thoughts on this?