UAD Powered Plug-Ins Manual v5.2 - Just Music

Release
The Release knob sets the value of the limiter release time. The default value
is Auto. The available range is from 1 second to 0.01 milliseconds.
Auto Mode
When the Release knob is fully clockwise, Automatic mode is active. In Auto
mode, release time is program-dependent. Isolated peaks will have a fast release
time, while program material will have a slower release.
Note: You can type “A” or “a” to enter Auto mode during text entry.
Mode
The Mode switch affects the attack shape of the limiter. Subtle tonal variations
are possible by switching the Mode between A and B.
Mode A is the default shape, suitable for most material, while Mode B can be
particularly useful on minimal and/or acoustic program material, yielding a
more subtle touch.
Power
The Power switch determines whether the plug-in is active. When the Power
switch is in the Off position, plug-in processing is disabled and UAD DSP usage
is reduced. When the plug-in is bypassed with this switch (but not by the
host bypass), the VU meter displays the unprocessed input signal level.
Precision Limiter Meters Overview
K-System
The Precision Limiter has precise, calibrated stereo metering. It offers the option
to use K-System metering, which is a method devised by renown audio
engineer Bob Katz (http://digido.com). The K-System is essentially a method
of integrating metering and monitoring levels to standardize the apparent
loudness of audio material while providing useful visual feedback of average
and peak levels.
Integrated Meter/Monitor System
The K-System is not just a metering system; it is designed to be integrated with
calibrated monitoring system levels. In a full K-System implementation, 0dB on
the level meter yields 83dB sound pressure level (SPL) per channel in the monitor
output level (86dB running two channels in stereo), when measured with
20-20kHz pink noise on an SPL meter set to C-weighted slow (i.e. average) response.
It is this calibrated meter/monitor relationship that establishes a consistent
average “perceived loudness” with reference to 0dB on the meter.
UAD Powered Plug-Ins Manual - 146 - Chapter 15: Precision Limiter