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Flash movie files (.swf) can use four types of audio compression: ADPCM, MP3, Raw, and Speech. ADPCM is compatible with all versions of the Flash Player. MP3 is compatible with most versions of Flash Player 4 and higher. The Speech codec is compatible only with Flash Player 6 and higher.
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When sound is imported to a Flash document, it's added and displayed in the Library panel. You can assign sounds from the Library panel to a keyframe on a timeline. You can also use sounds with ActionScript.
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Sounds can be assigned to the Up, Over, and Down states of a Button symbol.
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The Sync options control how a sound will play in relation to the rest of the timeline.
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Use the Loop setting in the Property inspector to multiply the length of the original sound.
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Stream sounds force the Flash Player to keep playback of the timeline in pace with the sound.
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Use a stopAllSounds() action to stop all sounds that are currently playing in the movie.
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The Effect menu in the Property inspector contains useful presets for sound channel playback. You can perform custom edits with the Edit Envelope dialog box.
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Global audio compression is controlled in the Flash tab of the Publish Settings dialog box.
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Use the Sound Properties dialog box in the Library panel to customize the audio compression schemes of individual sounds.
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The Sound Properties dialog box enables you to test different compression settings and to hear the results. The Export Settings section of this dialog box also provides useful file size information.
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You can bring and export Variable Bit Rate (VBR) MP3 sound files into Flash without degrading the encoding; however, Flash itself cannot encode using VBR.
