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Doc Q7.0
LFO Waveforms, Duty, and Phase
16.7
All of the modulation effects in the Axe-Fx II (Chorus, Flanger, Delay, Phaser, Tremolo, etc.) and the two Global
LFOs share a common set of waveform types—“shapes” that define the way they change over time. These are
represented below, together with an indication of how the
DUTY
parameter controls wave symmetry.
Remember that in cases where an LFO modulates the delay time (Chorus, Flanger, and any Delay blocks) it is the
slope
, rather than the actual LFO “value,” that determines the pitch offset at any moment. A triangle with a
constant up/down slope will “sound” like the square wave “looks.” A square waveform with no effective slope will
produce only a series of clicks unless used with “damping.”
Type
50 % Duty Cycle (Normal)
0% Duty
100% Duty
SINE
NA
NA
TRIANGLE
SQUARE
SAW UP
NA
NA
SAW DOWN
NA
NA
RANDOM
NA
NA
LOG
NA
NA
EXPONENTIAL
(EXP)
NA
TRAPEZOID
LFO Phase
16.7.1
PHASE
adjustments shift the alignment of the “RIGHT” or “B” LFO output. At 0° (below, far left), the two channels
are in phase; at 180° (below, far right), the two signals are phase-opposite, so while one is swinging from 0–100,
the other is swinging from 100–0 (and vice versa). Any interim setting is also allowed. Phase has no effect on the
Axe-Fx II RANDOM waveform.
