Guess I'll go first but I've mailed you about this before...
Firmware 3.40 oe-a:
Writing writing seems to be completely jacked up. Two issues:
1.) Writing to PSP/MUSIC results in nothing but PSPSeq doesn't crash...it goes through the motions, but writes nothing at all. I believe because on firmware 3.40, the music folder isn't even IN the PSP/ folder.
2.) Writing to PSPSEQ/WAV causes a crash when it's done writing. The program tries to go back and play, but you hear only a quick belch of sound and the sequencer crashes after playing the first step, freezing everything. HARD POWER OFF must be performed. However, the file written is just fine.