By default, the Flash authoring tool exports native audio at sampling rates of 5, 11, 22, or 44 kilohertz (kHz). However, many devices don't support playback of audio data at these sampling rates. For example, the Nokia Series 60 devices support only 8 and 16 kHz. In previous versions of Flash Lite, the player resampled the audio at runtime to 8 kHz before calling the device's native sound application programming interfaces (APIs) to pay the sound. This resampling required additional processing time and memory consumption.

In Adobe Flash CS3 Professional, you can choose to have the authoring tool resample your application's native audio at 8 kHz during the SWF file publishing process. You apply this setting to all stream and event sounds in your application, or just to specific sounds in your document's Library panel.

The first procedure that follows explains how to enable the 8 kHz sampling rate option for individual sounds in the Sound Properties dialog box; the second procedure explains how to use the Publish Settings dialog box to set this option globally for all event and stream sounds.