Weir's Rig 1977 - 1983
According to John Cutler, design engineer
for the Grateful Dead, the signal from Bob's Ibanez goes into an IVP preamp.
On that particular preamp there are two effects loops available; one is
after the preamp and before the equalization, and the other is post-equalization
and before the master gain. Cutler has built a switching system that uses
a logic-controlled relay to insert or delete what-ever effect is not in
the signal path when not in use; it's hardwired bypassed.
wahing, or a mix of the two. When he move the pedal
from back to forward, both the wah and phaser go up in tone. Most phasers
use an oscillator that sweeps back and forth, but this replaces the oscillator
with a footpedal. The rack also contains a Furman parametric equalizer
that he primarily used when doing both electric and acoustic sets on the
same night. He plugs his Ovation into the Furman.