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Doc Q7.0
FRFR
: “Full range, flat response.” This acronym is used to describe a “neutral” speaker or speaker system that is
designed to reproduce the entire audible spectrum of 20 Hz – 20kHz without emphasis or de-emphasis. It is
invariably an approximation.
Hz
: Hertz. The number of times something happens in one second. 4 Hz = 4x/second. Low values for Hz are useful
to describe RATES—the “speed” of a slow phaser’s sweep might be 0.33 Hz, for example (once every three
seconds). Hz are also the units used to plot low and high-frequency sounds. At the top of the frequency scale, units
of kilohertz (kHz or just “k”)—thousands of cycles per second—are more useful. You will see both Hz and kHz on
equalizers, filters, and other effects that deal with sound as a “spectrum” of frequencies. With a little time, you’ll
learn to match the numbers with their effects on a sound. Check the web for more info, such as
The Guitar Player
Book
(2007, free on Google Books), or get yourself this cool t-shirt from Rational Acoustics:
http://www.rationalacoustics.com/store/goodies/7-bad-system-dwarves-t-shirt.html
I/O
: Stands for “Input/Output.”
IR
: Impulse Response. An Impulse Response file is a collection of data representing sound measurements taken
from a speaker cabinet or system and used by the Axe-Fx II to enable the Cabinet block to emulate a particular
speaker cabinet. A test signal is played through the actual speaker, recorded, and used to generate a profile
utilized by the Axe-Fx II to reproduce the measured response.
Latency
: In terms of effect processors, latency is an unwanted delay between what you play and what you hear.
The Axe-Fx II latency is so low that it is equivalent to standing just a few feet away from a tube amp.
LFO
: Low Frequency Oscillator. An LFO creates control signals used to periodically change sounds in real time. The
back-and-forth sweep of a flanger or phaser, the sharp-flat wobble of a chorus, and the loud-soft pulse of tremolo
are each the result of an LFO at work.
MIDI
: Musical Instrument Digital Interface.
ms
: Milliseconds. Thousandths of a second. 500 ms is one half-second. 100 ms is 1/10th of a second.
