Every bass is different obviously. Electronics/pickups have nothing to do with sustain, unless your pickups are so close to the strings that they choke them (not unusual on guitar, rare on bass but possible).
In my opinion, sustain, and the sound generally, are heavily, HEAVILY reliant on the neck.
P basses tend to have thicker necks than some others, and this usually helps the neck to be stiffer. A stiffer neck will usually be a brighter sounding neck, and may sustain better. Carbon rods might help(hint-your P bass has them).
But the key to sustain(and 'punch') IMO, is mass, and specifically the relationship of neck-to-body mass, which is something I believe Roger Sadowsky may have explored/exploited a bit(IMO).
My own informal observations(after building a few bolt-on's) suggest that best results are had when the neck/tuners are approximately 25% of the total instrument weight.
Originally Posted by Bassist4Eris
My reggae skills are rudimentary enough that I just play whatever the original guy played. :)
Last edited by dmusic148 : 02-06-2013 at 12:53 AM.