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