Clipping sound when fade out volume

[kek]

Hi,

 

I use tweenlite to make a fade out on a soundchannel.

When the sound fades out, i hear a very distinct noise, a clipping sound, during the fade out.

 

This is very annoying because i make a music machine

 

I tried a lot of sounds files, WAV, MP3, 44khz, 22khz etc, but it seems that it comes frome flash itself.

 

Any idea ?

 

thanks

kek