strange sounds in audio exported from premiere pro cs3

[codemaster]

after editing and exporting, in the exported avi, the sections of the audio track where I used audio adjustments (such as hi-pass and volume keyframes) are producing noises that aren't present in the source audio track, nor in the timeline.

I tried exporting only one clip with audio adjustments, using the work area bar, and the exported track sounded normal, just like in premiere timeline. Only when I export the entire sequence, the resulted audio has theese weird noises, wich are similar to those generated sometimes on audio cd's between the ending of a track and the beginning of the next track.