• Find a sound or piece of music that is at least 20 seconds long that can use for the demo ident produced already.  It can be literally any kind of sound you wish (think outside of the norm perhaps). Then import it to Audition, edit it as you wish but make sure it is no longer than the ident you already have. Use fade in/out  options. Import sound to Flash.

Audio file formats

Adobe Audition can open audio files in the following formats:

▪                AAC

▪                AIF, AIFF, AIFC (including files with up to 32 channels)
There are many different variations of AIFF format. Audition can open all uncompressed AIFF files and most common compressed versions.

▪                AU

▪                AVR

▪                BWF

▪                CAF

▪                FLAC

▪                HTK

▪                IFF

▪                M4A

▪                MAT

▪                MPC

▪                mp3 (including mp3-surround files)

▪                OGA, OGG

▪                PAF

▪                PCM

▪                PVF

▪                RAW

▪                RF64

▪                SD2

▪                SDS

▪                SF

▪                SND

▪                VOC

▪                VOX

▪                W64

▪                WAV (including files with up to 32 channels)
There are many different variations of WAV format. Adobe Audition can open all uncompressed WAV files and most common compressed versions.

▪                WVE

▪                XI

Video file formats

The Waveform Editor lets you open the audio portion of video files in the formats below. The Multitrack Editor lets you insert the same file types and provides a preview in the Video panel.

To access these video formats, QuickTime must be installed. To import additional formats, extend QuickTime support. For more information, see this article on the Apple website.

▪                AVI

▪                DV

▪                MOV (including files with up to 32 audio channels)

▪                MPEG-1

▪                MPEG-4

▪                3GPP and 3GPP2

File format	Filename extensions
Adobe Soundbooth	ASND
Wave (Windows only)	WAV
Audio Interchange File Format (Mac OS only)	AIFF
MP3	MP3

▪       

Audio file formats Flash Professional CS5.5 can import

▪       You can import the following audio file formats into Flash Pro CS5.5 on Macintosh and Windows if QuickTime 4 or later is installed:

File format	Filename extensions
Audio Interchange File Format	AIF, AIFF
Sound Designer II (Macintosh only)	SD2
Sound Only QuickTime Movies	MOV, QT
Sun AU	AU
System 7 Sounds (Macintosh only)	SND
Wave	WAV

Sound resources

http://www.freesound.org/

the following link will allow you to download youtube videos to various file formats that can then be imported into Audition and the audio channel extracted.

http://keepvid.com