Apple Soundtrack Pro 3 - Manual (Page 280)

The control panel to the left of the display allows you to switch between the Analyzer
and Goniometer and contains parameter controls for the MultiMeter. The Stereo Level
and Correlation Meter are always visible.
MultiMeter with Spectrum Analzyer active
Spectrum Analyzer
The Spectrum Analyzer divides the audio signal into 31 independent frequency bands.
Each frequency band represents one third of an octave. The filter curves comply to IEC
document 1260.
You turn on the Spectrum Analyzer by clicking the Analyzer button. Turning on the
Spectrum Analyzer turns off the Goniometer. The four buttons under the Analyzer button
determine what portion of the input signal the Analyzer is displaying. You can choose
between Left or Right channel only. LR max shows the maximum band levels of either
channel, while Mono displays the levels of the stereo signal summed to mono.
The View options determine the level represented by the top line of the scale in the
display (Top; range: -40 to +20 dB) and the overall dynamic range of the Spectrum Analyzer
(Range; range: 20 to 80 dB). These two parameters can also be set directly in the display:
by dragging directly on the bar graph, you can shift the top line of the display. Dragging
directly on the dB scale allows you to compress or expand the scale’s range. The View
options are useful when analyzing highly compressed material as you can identify smaller
level differences more easily by moving or reducing the display range.
There are three display respond modes: RMS Slow, RMS Fast, and Peak. RMS Slow and
RMS Fast modes show the effective signal average (Root Mean Square) and offer a good
representation of the perceived volume levels. Peak mode shows level peaks accurately.
280 Chapter 10 Working with Audio Effects