Okay, to begin with I thought .RSEQ was a whole new format. It's not. To put it simply, RSEQ is basically SSEQ with a few modifications. Information on SSEQ can be found here, and I shall just report the differences :).
The first difference is obviously, the header. It's 'RSEQ' instead of 'SSEQ'. There is also now a mysterious gap of 16 bytes in between the main header and the 'DATA' header which has to be looked into =P. But after that gap, it's pretty similar to a SSEQ. Other differences:
Track Pointers - Where as SSEQs track pointers start with 0x93 with 4 extra bytes, RSEQs are now 0x88 with the same extra 4 bytes.
There is also a new header called 'LABL', not sure what this is for... But what I'm trying to say is... Eventually.. I'm sure someone with some knowledge of code could modify, maybe sseq2mid and utilities like that (as they include source), to work with Wii RSEQs.
I've tried changing the main header to SSEQ, and getting rid of the extra bit before the DATA header, changing all the track pointer's '88's to '93's like in SSEQ.. Then deleted the LABL data at the bottom to make it pretty much identical to a SSEQ.. But SSEQ2MID still doesn't like it :/.
I think I know why now... The track pointers aren't pointing to the right tracks, because I deleted that extra bit before the 'DATA' heading. I just need to know how to point them to the right places, and we should be able to do something with them :).
Just because no one responds doesn't mean we aren't interested. I'm certainly interested, but I really don't want a converter. However, if enough is learned about the format, that information can be used to create a program that can play the native format, and possibly output/convert it to a different one. Also, I've heard that if we had the means to play the sequences (the files you're running through), that would be valuable information that could lead to proper emulation of the hardware. I don't know how much help it would be, but I would certainly welcome *anything* that gets us closer to a NGC/Wii xSF format.
So, although I don't know how useful your information is, hopefully it's useful to someone who can use it to implement a means to play it back as audio. Good luck, and thanks for looking into it. Mouser X over and out.
Yeah, they're usually stored in '.brsar's =P I'm just trying to find out more about them so we can eventually convert them, edit them, and even replace them in games. Stuff like that =P.
If only I knew *something* about programming xD. Oh well :).