Audiokinetic

Editing Audio Sources

In the Source Editor the following operations can be applied to WAV files non-destructively:

Trim the beginning or end of the source
Apply fade-in or fade-out
Set loop points
Set a crossfade for smooth looping

All these operations are processed offline and not in real-time in the game. They are stored in the project's Work Units, are undoable, and reversible.

Trimming the Content of Audio Sources

Trimming the content in the WAV file saves space in WAV data. It can be used to remove silence at the beginning or the end of WAV files. Trimming the content is a non-destructive operation that occurs during conversion of the source material.

	Note
	The editing functions such as trimming, looping, and fades are not available for Audio Source objects in the Interactive Music Hierarchy, because these operations are available as part of the Music Segment and Music Clip objects.

To trim the source:

Drag the Trim Start (blue square handle located on the lower-left corner of the waveform) to the right.
Drag the Trim End (blue square handle located on the lower-right corner of the waveform) to the left.

Looping Audio Sources

Loop points are used when the Audio Source is contained by a Sound object that has the Loop property enabled. If loop points are present in the WAV file, they are used by default until the loop points in the editor are moved. As soon as the loop points are modified in the editor, the loop points from the file are no longer used.

The loop points are only used in the following conditions:

The Override file loop point is enabled
The parent Sound object is looping

	Note
	Setting or modifying the loop points in the Source Editor does not modify the original WAV file. This is a non-destructive operation. The loop points are stored in the project.

Editing the Crossfade Duration

A crossfade duration can be defined on the audio source to obtain a smoother looping behavior in case a clicking sound is heard during the loop.

	Note
	To avoid looping clicks and pops, it is always recommended to position loop points at a zero crossing positions of the PCM data.

To adjust the loop points, with a crossfade:

Drag the Loop Start (green handle, located on the top-left corner of the waveform) to the right.
Drag the Loop End (Red handle, located on the top-right corner of the waveform) to the left.
Define a crossfade duration.

Editing Fade-In and Fade-Out

A fade-in and fade-out can be created in the Source Editor by dragging the fade handles (blue triangle). Fades are applied to the converted file, and do not require additional processing during the playback of the source.

To create a fade-in and a fade-out

Drag the Fade-in handle (blue triangle handle, located on the top-left corner of the waveform) to the right.
Drag the Fade-out handle (blue triangle handle, located on the top-right corner of the waveform) to the left.

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