Musser M-48 vibraphone w/K&K pickups & pre-amp going to: 1) wah wah pedal, 2) fuzz tone, 3) envelope filter, 4) vibrato, 5) Moog ring modulator, 6) rotary sound processor plugged into a Kustom rolled & pleated P.A. head, the details explained in the article Signal Path:
an Explanation of Moving Air with Mallet Instruments.