PSPSeq is a homebrew audio synthesis and sequencing application for making music on the PSP.

New features:

– loading and saving of synthesizer presets
– exponential frequency modifying envelopes for all generators
– memory optimizations allowing for handling up to 7 MBytes of samples within a song
– FM generators improved to include feedback parameters
– per-step pan
– faster load/save of sequencer data
– configurable color schemes
– better envelope controls

http://forums.qj.net/showthread.php?t=142490