.sseq

An .sseq file is a music sequence. It is essentially a MIDI file for the Nintendo DS.

File Specifications
For specifications on the sseq format, look at one of the following pages:

emutalk

kiwi.ds (downloads the HTML file)

Tahaxan (DEAD LINK)

Programs to Edit .sdat Files
sseq2midi - Converts an sseq file to MIDI for editing with a regular MIDI editor. midi2sseq - Converts a MIDI to sseq. NDS Sound Extractor (Read only, works on an .nds rom and automatically extracts or converts sseq data)

Note that Jump/Call/Loop events in original SSEQ files are lost when they are converted into MIDI files.