Specifications

DigiRack Plug-ins Guide86
Meter Types
Peak (Default meter type) Uses the metering
scale in DigiRack EQ III and Dynamics III plug-
ins.
RMS (Root Mean Square) was used in previous
versions of the Digidesign SurroundScope plug-
in and uses the same “true” RMS metering scale.
Peak + RMS Uses a multi-color display to show
both types of metering. Peak metering is shown
in conventional green color, while RMS meter-
ing is shown in blue.
VU (Volume Unit) Uses AES standards for signal
level indication.
BBC Uses IEC-IIa standards for signal level indi-
cation. This style of metering suppresses short
duration peaks that would not affect broadcast
program material. Reference calibration (4 dB) is
–18 dBFS.
Nordic Uses IEC Type I standards for signal level
indication and provides greater resolution for
readings between –10 dBu and +4 dBu. Refer-
ence calibration (0 dB) is –18 dBFS.
DIN Uses IEC Type I standards for signal level in-
dication and provides greater resolution for
readings between –10 dBu and +5 dBu. Refer-
ence calibration (–9 dB) is –18 dBFS.
VENUE Provides Peak metering behavior with a
meter scale calibrated specifically for Digidesign
VENUE systems. Reference calibration (0 dB) is
–20 dBFS.
Meter Peak Hold Options
Each of the SignalTools plug-ins lets you choose
the style of peak hold when peaks are shown in
the plug-in meters.
3 Second Displays peak levels for 3 seconds
Infinite Displays peak levels until meters are
cleared
No Peak Hold Does not display peak levels
Reference Mark Options
Each SignalTools meter type lets you adjust the
level of the reference mark on the side of the
meter display. The mark is set by default to the
reference level for the corresponding meter
type.
To change the reference level of a SignalTools
meter:
 Drag the reference mark to a different location
on the meter scale.
The “true” RMS meter scale is not the same
as the AES 17 RMS scale. For a sine wave
with a peak value of –20 dBFS, the “true”
RMS meter will show a value of –23 dBFS.
(The same sine wave will show a value of
–20 dBFS on an AES 17 RMS meter.‚
Meter values are always displayed on con-
trol surfaces in dBFS values, regardless of
the Meter Type setting.
SignalTools meters also change color to
show different ranges of level. The relative
range of color automatically adjusts to fol-
low the current Reference Mark setting in all
meter types (except Peak+RMS).