jazz.madskills.org has the modules. (thx to Monolith)
and btw you can't record modules. the j2b source code is still unreleased so it will remain secret to us how j2b is played outside jazz jackrabbit 2. if you are so upset on recording ingame music you could try connecting mic to speaker port, record and save as wave, mp3, whatever or set your record device on your soundcard to "what u hear" and do the same.