A local bassist, Carlos Garcia, is also mentioned as "an influence" in Bob Bobbing's liners to Portrait Of Jaco: The Early Years
. Garcia had the muted 1/16th note thing goin' on &, IIRC, Garcia was also using an Acoustic bass amp. Garcia's band was named Nemo Spliff.
General Music Theory happened pre-Weather Report with Charlie Brent (Jaco's stint with the C.C. Riders)...this is mentioned in Bill Milkowskoi's Jaco bio.
Here's an excerpt from Milkowski's book; talks about Garcia/Nemo Spliff- http://www.allaboutjazz.com/php/arti...?id=31395&pg=3