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4.
Drag the Dry Out fader up. Notice the audible change in output as the balance between the Wet Out and Dry Out values changes.
Tip:
If you are experiencing difficulty previewing processing in real-time, decrease the Quality/speed value.
5.
Drag the Response delay slider to the right. Notice the audible change in the reverb’s delay.
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 171 and Previewing
processed audio on page 173.
General tab controls
The following sections describe all controls located in the General tab.
Control Description
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
Apply envelope and limit decay
to (seconds)
The Wet Out fader controls the amount of processed signal mixed into the output.
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 217.
Low-shelf start frequency/High- Acoustic Mirror high- and low-shelving filters to allow you to tailor the frequency response of
shelf start frequency 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.
Quality/speed The Quality/Speed slider allows you to strike a balance between the quality and speed of the
audio processing. Lowering this value immediately affects the frequency response of the
impulse. The processed signal sounds dull and high frequencies sound unnatural. At very low
values, the length of the impulse is shortened. When this control is set to a high value, the
audio quality is excellent, but the processing takes longer.
If you are experiencing difficulty previewing processing in real-time, decrease the Quality/
speed value. However, you must return this value to 5 prior to actually processing the file to
output the highest possible quality.
216 | CHAPTER 13