user manual

CHP. 10 PROCESSING AUDIO
163
Pan/Expand controls
The following controls are located in the Pan/Expand dialog if you are using the full version of Sound Forge,
or the Graphic Pan dialog if you are using Screenblast Sound Forge.
Process mode drop-down list
The Process mode drop-down list contains the following options.
Output gain
Determines the amount of gain applied to the signal following pan/expand processing.
Show wave
The Show wave drop-down list provides several settings for drawing the current selection’s waveform on the
envelope graph. This function is available only for small selections.
Reset Envelope
Clicking the Reset Envelope button clears all but the two original envelope points.
• For the
Pan modes, these two points prevent unintended panning.
• For the
Stereo expand and Mix Mid-Side modes, these two points prevent unintended expansion.
Resample
The Resample command allows you to change the
sampling rate of a file without altering its pitch or
duration.
• Resampling to a lower sample rate results in less
frequent samples and a decreased file size, but adds
aliasing noise to the audio. For more information, see
Apply an anti-alias filter during resample on page 165.
• Resampling to a higher sample rate results in extra
samples being created through interpolation and an
increased file size. Like increasing bit depth, up-
sampling does not improve the quality of an audio file,
but permits subsequent audio processing to be
performed with greater precision.
Option Description
Pan (preserve stereo
separation)
Applies the pan effect without mixing the channels, thereby simulating the spectral
positioning of stereo recordings.
Pan (mix channels before
panning)
Mixes the left and right channels prior to applying panning effects.
Stereo expand Available only in the full version of Sound Forge. Allows you to contract or expand
the image of stereo audio from dead center (mono) to completely panned wide (no
center channel).
Mix mid-side (MS)
recording to left and right
channels
Available only in the full version of Sound Forge. Simulates a recording technique in
which one microphone is pointed directly at the source and used to record the center
(mid) channel, and a second microphone is pointed 90 degrees away from the source
(side) and used to record the stereo image.
For proper playback on most systems, MS recordings must be converted to standard left/
right orientation.
To convert an MS-recorded track to a left/right track in Sound Forge, first ensure that
the center channel is in the left track and the side channel on the right. The MS mix
function is then used to set the width of the stereo image for the converted track.