Tim Commerford Audioslave bass tone

I remember reading an interview with bass player Tim Commerford. He spoke (bragged) a lot about how he has put a great deal of effort into developing his sound (building / modding effects pedals, maybe even winding his own pickups, I forget all). He was quite secretive about the details, and quite arrogant. I listened to an Audioslave CD on headphones at B&N, and found the music uninteresting, but couldn't hear the bass too well & still wonder whether his sound measures up to his claims. Since people here have the hearing and systems to tell, is there anything special about his sound?