The PSP Rhythm guys have released a Bassline test for the PSP, heres the info:
I have a working PSP Bassline test for you to check out. Very simple tb 303 style synth. The test has a hard coded beat that you can turn off and on. You can program your own basslines although you can't save. You can download it for a PSP 1.5: HERE. I wrote yet another audio engine and this one seems to be the tightest. My goal is to bring this into PSP Rhythm so you can have a bassline and drum machine/sampler to make music.