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LEARNING THE SOUND FORGE WORKSPACE CHP. 3
PPM scales are useful for monitoring peak levels. The meters use a fixed integration time (5 or 10 ms) that is
sensitive to increases in volume, but the meters are less sensitive to decreases in volume than the VU scales,
which produces less meter activity and decreased eyestrain.
Displaying VU/PPM meters
Sound Forge provides peak and VU/PPM (peak program) meters that you can use to monitor your audio
levels.
You can toggle the display of the meter’s VU/PPM scale on and off. Right-click the meter and choose
Show
VU/PPM
from the shortcut menu.
Adjusting the VU meters’ sensitivity
Unlike peak meters — which read instantaneous changes in your audio signal — the VU/PPM meters read a
portion of the signal and calculate the average level. The size of the signal that the meters read is determined
by the meters’ integration time.
To set the amount of data surrounding the cursor that will be used to calculate levels in the VU meters,
specify a value in the
VU meter integration time box on the Other tab of the Preferences dialog (to access the
Preferences dialog, choose
Preferences from the Options menu).
The PPM scales use a fixed integration time:
Showing labels
Right-click the meters and choose Show Labels from the shortcut menu to toggle the meter dB markings on
and off.
Holding peaks and valleys
Right-click the meters to access the Hold Peaks and Hold Valleys commands in the shortcut menu.
• Choose
Hold Peaks to display a marker on the meters indicating the highest reading.
• Choose
Hold Valleys to display a marker on the meters indicating the lowest reading.
Scale Integration time
UK PPM 10 ms
EBU PPM 10 ms
DIN PPM 5 ms
Nordic PPM 5 ms