Don't get it wrong. It is a good idea. I guarantee that there's tons of people who would *love* to have USFs on their PSP. If I had a PSP, then I'd want to do that. But it is rather difficult to do it. That's the issue more than anything. No one here is saying "Don't do it because it can't be done," or "You'd be wasting your time to do that." It's more that, although it's something people want, it takes a lot of knowledge on how to do it. It's not an easy task. MP3s, at this current time, are far more practical than USFs. Or you could of course use OGG, or even FLAC. If you had the dedication for it, maybe you could port VGMstream (or portions of VGMstream) to the PSP, and even getting ADX or Looping OGG support on the PSP. While not USFs, it does allow for looping the audio data. Once you've got that, it's only a matter of work and effort to find the loop points of the WAVs (from USFs) so that you can convert them to ADX or OGG.
I don't mean to be rude (and hopefully no one else does either) in what I said earlier. But for now, your best option is MP3s (or other similar foramts). If you want to port VGMstream (or portions of it) to the PSP, then please do so! That'd be awesome! Especially Looping OGG support! :D While Looping OGGs certainly aren't as small as USFs, they're better than WAVs and ADXs.
Sorry I can't help any more than that. Mouser X over and out.
by nensondubois at 3:18 PM EDT on September 18, 2008
Thanks. I should have guessed the obvious method of converting is the only way for now. There is an ADX player for the PSP but it's buggy which supports many other formats as well called Game Music Gear; I posted the link here before.