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CHP. 12 USING ACOUSTIC MIRROR AND WAVE HAMMER
187
The horizontal axis of the graph represents the time of the impulse file and the vertical axis represents peak
amplitude in dB. Specifying an impulse file from the
Impulse drop-down list automatically displays its
envelope in the graph.
Note:
If the impulse file is greater than 6 seconds in length, it
does not display in the envelope graph.
Envelope points
Envelope points are used in the envelope graph to specify a fade curve. The fade amount can vary from 0%
to 100%. You can create, delete, and arrange envelope points just as you can in all of Sound Forge’s envelope
graphs. For more information, see Envelope graphs on page 39.
Note:
The fade value at any point in a curve does not use
the same vertical logarithmic (dB) scale used for displaying
the impulse file.
Adjusting the impulse length
Drag the vertical Envelope Endpoint line to the desired location. The Envelope Endpoint repositions and the
length of the impulse adjusts.
Reset
Clicking this button resets the envelope points to 100%, indicating no fade.
Package Impulse into Preset
Clicking this button creates a link between the current preset and the selected impulse file, along with
encoding the impulse information. You can use the Preset Manager to share presets and the accompanying
impulse files between computers without losing information. For more information, see Using the Preset
Manager on page 177.
Summary tab controls
The Summary tab provides information about the impulse file. The following section describes all controls
located on the
Summary tab.
Impulse
This control is identical to the Impulse drop-down list on the General tab. For more information, see Impulse on
page 185.
Dry Out
This control is identical to the Dry Out fader on the General tab. For more information, see Dry Out on page
185.
Repositioning the envelope endpoint line