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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.

Repositioning the envelope endpoint line

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.

CHP. 12

USING ACOUSTIC MIRROR AND WAVE HAMMER