I have been going into the specific album and selecting all files. Then choosing 'convert format' to the desired bitrate. This will save an optimized copy to the directory called 'Optimized Files'. I then delete the album from SonicStage, delete the original directory that contains the wav file. Then import from the 'Optimized File' directory. That is what I have been doing for the few files that I want converted to Atrac. Hope this helps.