Hi There are a lot of jazz basses out there. I would like to know why and what you do to "improve" your jazz bass performance/sound. I thought a poll would be great so we can see what the most popular mods are. Pictures can also be helpful. I will start : 1.) Sheilded the electronic/pickup cavity in my Geddy Lee to make it quieter. 2.) Added push/poll pot for series/parallel option for pickups...really adds an extra pseudo P bass tone. 3.) Added Hipshot De-tuner for playing "D" tuning blues. 4.) Added graphite saddles to my 03 US S-1 Jazz that is strung with Pyramid Flats..so the string will sit better in the saddle and reduce chance of breakage.