A merchant approaches you! o__O
"Yaargh, wish I had wares to sell ya!"
PSPSeq is a powerful homebrew music creator for the Sony PSP. It is capable of 16 simultaneous instruments of either built in synthesizer or .wav sample playback. Synth instruments come in a variety of different synth+effect combos.
The 64 step sequencer has unique synth and effect parameters for each step, and can combine patterns into songs of up to 100 unique patterns.