558 Glossary
PRO1 Live Audio System
Owner’s Manual
Point scene: Subdivision of a scene. See
Scene.
Pointer: 1. On the GUI, the pointer is the
arrow-shaped object on the screen that moves
when the user moves the trackball or external
mouse. 2. On a control knob, it is the marking
that, when used in conjunction with the ident
around edge of control knob, helps to indicate
the setting.
POPulation group: A number of channels
assigned to a group that has unfold and area B
controls. Provides an easy and quick method of
manipulating and controlling the numerous
channels available on the PRO1 Live Audio
System.
Post-: The point for accessing audio just after it
leaves a specific channel component, for
example, “post-fader”, where the audio is
tapped from just after it leaves the channel’s
main level control.
Pre-: The point for accessing audio just before it
reaches a specific module, for example,
“pre-EQ”, where the audio is tapped from just
before it gets to a channel strip’s EQ.
Processing area: Also known as “detail area”,
a control section in the channel strips.
Pschycoacoustic noise: Noise that affects the
physiology of the listener.
PSU: Abbreviation for “power supply unit”.
Psychoacoustics: The study of the perception
of sound, that is, how we listen, our
psychological responses and the physiological
effects on the human nervous system.
Q
Quick access button: Button for quickly
selecting its associated strip section.
R
RAM: Abbreviation for “Random access
memory”.
Return: Auxiliary return or aux return. An
extra input used for receiving a signal from the
output of an internal or external effect
processor. See Bus.
Reverb: An effect where the ambience of a
physical space is simulated. This is done by
copying a signal and replaying at regular
intervals at ever decreasing levels. The
intervals are so close that each copy is not
heard individually.
RHS: Abbreviation for “right-hand side”.
RMS: Abbreviation for “root-mean-square”. The
square root of the mean of the sum of the
squares. Commonly used as the effective value
of measuring a sine wave's electrical power. A
standard in amplifier measurements. The
effective average value of an AC waveform.
RS: Abbreviation for “right surround”. The
right-hand rear speaker in a 5.1 surround
system.
S
s: Symbol for “second”; a unit of time.
Scene: In automation, a set of mix settings for
a particular part of a play or song.
Sibilance: Energy from a voice, centred around
7kHz, caused by pronouncing "s", "sh" or "ch"
sounds.
Side chain: A special circuit that diverts a
proportion of the main signal so that it can be
processed, as required. Compressors use the
side chain to derive their control signals.
Signal flow: The path of a signal from one
place to another.
SIP™: Abbreviation for “solo in place”.
SIS: Abbreviation for “spatial imaging system”.
Combines a central loudspeaker cluster with a
left-right system to form three discrete sound
channels.
Snapshot: A captured group of mixer settings
that reflect the state of the mixer at a particular
moment within a performance. This snapshot
can then be recalled at the required moment in
the performance/playback.
Solo: During monitoring, the isolation of one
signal by silencing all other signals.
Source: The patch connector from which a
signal is patched. See Patching.
SPL: Abbreviation for “sound pressure level”.
Given in decibels (dB), SPL is an expression of
loudness or volume.
Splash screens: The GUI display during power
up.
SRC: Abbreviation for “sample rate converter”.
SSD: Abbreviation for “solid-state disk”. Data
storage device that uses non-volatile memory to
store data. Quicker than the conventional hard
disk and less susceptible to the failures
associated with hard disk drives.
Status indicator: A device specifically designed
to show the condition of something. For
example, an LED that shows whether a
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