Amp/Cabinet Modeling - DigiTech RP55 Owner's Manual

Pickup/Wah Type - The Value buttons select the Pick Up or Wah type that is simulated.
Compressor
A Compressor is used to automatically limit the dynamic level of the guitar signal.

Amp/Cabinet Modeling

Amp Modeling is a technology that applies the tones of several popular modern and vintage
amps and acoustic guitar simulation. Values 1-9 increase the amp's gain and level.
b1-b9 - Based on a Blackface
o1-o9 - Based on Boutique
r1-r9 - Based on a Rectifier
H1-h9 - Based on a Hot Rod
t1-t9 - Based on a Classic Tweed
C1-C9 - Based on a British Combo
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14
OF - Turns the Pickup Simulator / Wah module off.
SH - Gives a single coil pick up the warm tone of a humbucker.
HS - Gives a humbucker the unique sound of a single coil.
Cr - Cry Wah is a traditional sounding Wah.
bo - Boutique Wah is a wider sweeping Wah with a more modern sound.
Fr - Full Range Wah sweeps the entire spectrum of audible frequencies.
1 to 15 - Controls the amount of compression (ratio and sustain) and ranges
from 1 (slight compression) through infinity (maximum sustain) or
turns the compression effect off.
c1-c9 - Based on a Clean Tube amp
s1-s9 - Based on a British Stack
U1-U9 - A nice crunchy tube combo
G1-G9 - Based on High Gain tube amp
F1-f9 - A vintage fuzz distortion
AC - A flat top acoustic guitar