user manual

CHP. 12 USING ACOUSTIC MIRROR AND WAVE HAMMER
185
The Acoustic Mirror dialog
The Acoustic Mirror dialog contains four tabs: General, Envelope, Summary, and Recover. Each tab contains
controls that allow you to precisely configure the effect as well as recover custom impulses. Notice that the
Acoustic Mirror dialog contains the preset and preview controls found in all of the Sound Forge process and
effect dialogs. For more information, see Applying presets on page 145 and Previewing processed audio on page 146.
General tab controls
The following sections describe all controls located in the General tab.
Impulse
The Impulse drop-down list allows you to specify an impulse file from a list of those previously used. Clicking
Browse displays the Open Impulse File dialog and allows you to locate an impulse file from your local system
or network.
Response width
You can use the Response width slider to create some simple stereo expansion and stereo collapsing effects.
This control’s default setting of
50 represents normal stereo operation and is recommended to maintain the
stereo field of the impulse response. A higher setting expands the stereo field, but may result in an unnatural
sounding effect. Lowering this setting narrows the stereo field. A setting of
0 is essentially mono.
Response delay
The Response delay slider controls the time, in milliseconds, that elapses between the dry signal and the
processed output. This control can be used to create interesting effects and add new dimensions to an
acoustic signature. Configuring this control with a positive value results in the processed output following
the dry output. A negative value results in the processed output preceding the dry signal, or a pre-delay.
Pan (left to right)
The Pan slider controls the balance between the left and right channels in stereo files. The default value is 0
and indicates a typical center position.
Dry Out
The Dry Out fader controls the amount of unprocessed signal mixed into the output.
Wet Out
The Wet Out fader controls the amount of processed signal mixed into the output.
Apply envelope and limit decay to (seconds)
When you select this check box, the length of the impulse is limited to the time specified in the adjacent
box. Limiting the length of an impulse file shortens the decay of the reverberation and decreases the amount
of processing required.
In addition, selecting this check box results in the impulse fading according to the
Envelope Graph configured
on the dialog’s
Envelope tab. For more information, see Envelope Graph on page 186.
Low-shelf start frequency/High-shelf start frequency
Acoustic Mirror offers high- and low-shelving filters to allow you to tailor the frequency response of the
impulse. Notice that you can adjust the cutoff frequency and boost/attenuation of each filter independently.
Convert mono to stereo
Selecting the Convert mono to stereo check box converts a mono signal to stereo output. If the impulse file is
in stereo, selecting this check box imparts a pseudo-stereo effect on the mono input.