AVCHD Dolby AC-3 link to AMA - Waveforms not visible

Hi dear people,

if I link to AMA some files with Dolby AC-3 sound, I cannot see the waweforms.

Of course, if I transcode it, I can see them, but as I have many hours of material, I'd like to stay with AMA as long as possible in the editing process.

Do you know this problem?

Any solution? 

Thanks a lot, Bilbo