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The Effects
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The expander module is sort of a “compressor in reverse”. When the signal level is below the
threshold the gain is reduced. The Axe-Fx Ultra
TM
Gate / Expander block can be used as a gate or
expander (as the name suggests).
Parameters
THRSH -
Threshold control. The Gate / Expander reduces its gain when the input power is below
this value.
ATT -
Attack time. Sets how fast the Gate / Expander restores the gain once the threshold is
exceeded. Lower values equal faster response.
HOLD -
Hold time. Sets how long the Gate / Expander holds the gate open once the threshold has
been exceeded.
REL -
Release time. Sets how fast the Gate / Expander reduces the gain once the signal has fallen
below the threshold.
RATIO -
Sets the gain expansion ratio. This is the ratio of input power to output power below the
threshold. If the input power is -40 dB and the threshold -30 dB and the ratio 2, the output power
will be -60 dB (two dB reduction for every one dB below threshold).
SCSEL -
Selects the sidechain input source.
INPUT
is the normal setting and selects the block input
(sum of the rows feeding the block) as the sidechain source. The other settings allow isolating a
single row as the sidechain input. The other rows are summed as usual. By using a row as the
sidechain input you can use the Gate / Expander as a ducker or de-esser.
LOWCUT -
Sets the frequency of a highpass filter on the sidechain input.
HICUT -
Sets the frequency of a lowpass filter on the sidechain input.
Multi-Band Compressor
The Axe-Fx Ultra
TM
contains a three-band compressor that is great for mastering or compression of
a whole mix. It also works great after distortion to help thicken the tone.
The basic principle of the Multi-Band compressor is that the input is divided into three bands using
a crossover. Compression is applied to the individual bands and then the outputs recombined. This
allows isolating bands of the input material and applying different amounts of compression. Multi-
Band compression is the de-facto mastering tool and can really improve the final mix.
Parameters
FREQ1 -
Sets the crossover frequency between band 1 and band 2.
FREQ2 -
Sets the crossover frequency between band 2 and band 3.
Each compressor section has it’s own menu page with the following parameters:
THRSH -
Threshold control. The threshold at which output compression starts to occur.