hi,
I used a 1971 Fender Fretless with a jazz pickup installed. If you go to www.bassplayer.com, the article has info on that bass. The only pedal I used on that track, and have used on almost all my recordings, is a Boss compressor that has three knobs (the two knob and 4 knob do not sound good to me). It helps bring out harmonics and with the fretless, it makes it a lot more compressed (obviously) and mid-range-e.
Hope that helps,
Juan