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o Ratio Button – This button steps through the Ratios.
Holding for a second will step backwards.
NOTE: The two highest Ratios (12:1 and 20:1) have a
higher threshold.
o Attack and Release Knobs – These are pots that step
through 8 selected ATT/REL times. There are no detents,
but a change to a new value as one rotates is indicated by
flashing the 30dB GR LED. OPTO Release is a special
release unto itself, adding a complex program dependent
tail on the last few dB of release. Great for Vocals, Bass,
and has the general character that Opto Compressors are
known for. Try 3:1, Attack 10mS, OPTO Release, Sat and
Det HP on.
NOTE: The two longest Release settings (.5sec and
Opto) will lower the compressor threshold
o Saturation (Sat) and Det HP Button – This middle button
steps through two modes: (1) Saturation Mode adds a
fixed amount of soft clipping and harmonics to the signal,
while (2) Det HP helps prevent low sub-frequencies from
unnatural pumping the source. The Saturation is fixed, but
different Ratios and Attack times can increase or decrease
the amount of soft clipping during compression.
o AtMod Knob – AtMod is a proprietary function used first
in Empirical Labs Arousor Plug-in. The PUMP makes it
available as a controllable hardware process, for the first
time. This slows up the initial attack, especially when
compressing well over 6dB where this control is usually
used. As you turn AtMod up from zero, the AtMod LED
will start lighting, indicating a subtle effect on percussive
attacks, adding a unique "Smack" to them. As you go
further into AtMod, the peak compression will start to be
affected, and limited. This is usually beyond its intended
subtle use, but… who cares, if it sounds great? AtMod is
greatly affected by Ratio and Attack settings.
o Bypass Button – True Bypass of processed signal. In
Bypass, all GR LEDs will light and pulse. Gain Reduction
continues behind the scenes, so going OUT of bypass
does not cause a jarring level change.
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