DSP Music has released version 3.0 of PSPSeq, a free homebrew application for composing music on the Sony PSP handheld game system.
PSPSeq contains both realtime synthesis and sample playback capability, along with multiple FX modules of widely varying types for modifying instruments in countless ways. PSPSeq also has a powerful and unique step sequencer for [...]

The PSP RHYTHM development team has released RHYTHM version 8, a free music sequencer for the PSP.
According to the team:
RHYTHM version 8 has been in development for over one year. We have rebuilt the audio engine from the ground up, making many improvements. The User Interface and controls have also been completely redesigned to streamline [...]