Crate Amplifiers Semi-Technical Description, GT-80D QuadraDrivetm, “What isreverb, anyway?”

GT-80DQuadraDrivetm

ABOUT THE DIGITAL SOUND PROCESSOR:

(Semi-) Technical Description:

“What is reverb, anyway?”

Imagine yourself seated in a small, lightly furnished room, about to enjoy a private performance by your favorite guitarist. The guitarist picks up an acoustic guitar and sharply strikes a single chord, then immediately mutes the strings with his strumming hand. Sound waves instantaneously travel from the guitar’s sound hole through the air to you ears, where your brain processes the waves into the musical sounds you know so well. At the same time, reflected sound waves are bouncing all around the room: off the walls, ceiling and floor, off of the musician, off of you; off of everything in the room. These multiple reflections occur so fast and in such large num- bers that your ears perceive them as one sound: reverb. Without these reflections the sound from the guitar would seem lifeless, dry and unnatural.

Different rooms produce different reflections, thus producing different sounding reverbs. The same guitarist’s single-chord performance in a large concert hall would sound different than it did in the intimate surroundings described above, due to the different reflections produced - thus, the different sounding reverb.

What can be produced by nature can be simulated through the use of the GT-80D’s highly sophisticated digi- tal electronics circuitry. The GT-80D has many different reverbs available, as well as some unique digital effects, not found in nature.

	ANALOG INPUT	DIGITAL
FROM AMPLIFIER		SIGNAL
		I0I0I...
		ANALOG/
		DIGITAL
		CONVERTER
	INPUT FILTERS
	(ANTI-ALIASING
	FILTER)

CONTROL	NON-VOLATILE
	PARAMETER
SWITCHES
	MEMORY
Algorithm
Selection
Channel
Switching
DIGITAL	DIGITAL
ANALYSIS	SYNTHESIS
COMPUTER

ANALOG OUTPUT

DIGITAL/

ANALOG

CONVERTER

OUTPUT FILTERS

(RECONSTRUCTION

FILTER)

PROGRAM

MEMORY

SAMPLE

STORAGE MEMORY

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