User manual

204 Chapter 9 Working With Audio Effects
 High-frequency and low-frequency reverb time: These parameters let you specify the
decay of higher and lower frequencies separately. Different surfaces, such as wood
floors and concrete walls, absorb high and low frequencies at different rates, and
these parameters let you simulate the sound of different environments more closely.
 Reverb envelope: Lets you control how much the volume of the reverb changes over
time. In natural acoustic situations, the reverb echoes decay gradually over time. You
can re-create this gradual decay, or gate the reverb so that it cuts off more abruptly.
Meters and Diagnostic Effects
Diagnostic effects help you analyze and clean up audio in a variety of ways. Each type
of diagnostic effect provides a different way to “look at” an audio clip or file, and each
has a unique set of parameters. These effects are available only as realtime effects in
the Effects tab and the Mixer, not as processing effects.
Correlation Meter
The Correlation meter displays the phase relationship of a stereo signal. A correlation of
+1 (plus one, the far right position) means that the left and right channels “correlate”
100% (that is, they are completely in phase). A correlation of 0 (zero, the center
position) indicates the widest permissible left/right divergence, often audible as an
extremely wide stereo effect. Correlation values less than zero indicate that out-of-
phase material is present, which can lead to phase cancellations if the stereo signal is
combined into a monaural signal.
MultiMeter
The MultiMeter combines the functions of the Level Meter and Correlation Meter (as
described above) with several other analysis tools:
 A Spectrum Analyzer
 A Goniometer for judging the phase coherency in the stereo sound field
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.