You can add picoloop which is a native psvita vpk. It is a 4 track sequencer/synth.
Here is the release page :
https://github.com/yoyz/picoloop/releases
Here is the download link for the vpk :
https://github.com/yoyz/picoloop/releases/download/picoloop-0.76a/picoloop-20170118-0.76a-psvita.zip...