Aiff Delete tag not having affect when simply truncate the files

[IJabz]

Aiff Delete tag not having affect when simply truncate the files, seem okay no errors during dleettion. But then reread the file and it stil seems to exist.

[IJabz]

The problem was the test code because after deleting tag it used audioFile.commit() which then writes the tag that existed in the tag.

[IJabz]

No bug to fix but highlighted that audioFile should have a f.delete() method analagous to its f.commit() method.