Larry Hartke was looking for a big-name endorser from the get go, and given his dire financial straits, Jaco never balked at freebies. He may have used one a few times, but his tone was his bass itself and the way he played it. I heard tons of bootlegs with him playing through all sorts of different house rigs, and aside from some small coloration, the amps always sounded like Jaco, good AND bad.