Do any XA creation/conversion tools exist?

[wibble1]

As in "convert an existing WAV to an XA file" or "create a new XA file from scratch".


There appear to be tools for STR creation, but I'm stumped if I can find any that'll basically let me make my own XA files for PSX consumption.


Any suggestions?


EDIT: In fact, I wish I could also find a site that told me everything I need to know about how XA audio works in a PSX sense.

I'd love to be able to, say, decide which subsongs out of a large single XA file to rip or to keep, rather than just dummying the whole file. I've tried looking at XAs through a hex-editor but it's still awfully tricky.