Pedalboard / 058
Frank Zappa
Zappa's floor controller addressed a custom relay-switched rack that split his guitar into stereo clean and dirty outputs, adding fuzz, delay, tape echo, pitch shifting, phasing and studio dynamics without forcing every processor into one serial path.
Signal path / A
Blue Box four-output effects system
Technician-documented 24-module rig - parallel routing
Documented equipment · Source-described order · Split output path
Studio Sound interviewed guitar technician David Gray while the system was being prepared and documented its signal split, jump-loop relay design, four outputs and named processor inventory. Dweezil Zappa independently confirms the multi-amp plus clean-DI architecture and the Big Muff, MXR delay, Eventide Harmonizer and dbx compression families. The display represents the named effect loops, not a fixed cable order: Gray stated that the modules were regularly repatched to test combinations. Buffers, Alembic preamp, Yamaha mixer, VCA blend controls, Burwen and Clear Sound integrity modules and the 24-switch remote are documented but omitted as routing utilities.