For the stuff that is acutally vital, UID, version,
instrument name,
whatever, then yes. But anything more sophisticated than that /really/
should be external. Internalised metadata systems invariably end up being
inadequet, clumsy or just useless (ala LADSPA).
The only meta-data I included is stuff that might pop up in an 'About' box.
Presets and the likes BEG to be external.
Tim