rule for: None of the files

HI
I have a lot of folders on my iTunes folder.
Some of them are empty because I managed music via iTunes, so when I deleted an album the folder is empty but the JPG cover is in there, and some other files as Lyrics files, and so on...
I need a Rule that detects if ALL the files are not mp3 (or NONE of the files are mp3) and then delete the Folder. No success so far.
Right now I got:
if Kind is Folder
and
Subfolder Depth is 1
Run rules on fodler contents
And this one:
if kind is Folder and
Subfolder Depth is 0 and
Sub-file/folder Count is less than 5
Then Delete folder
The problems is some albums with 2 or 3 tracks are deleted.
any hint would be much appreciated
Thanks
I have a lot of folders on my iTunes folder.
Some of them are empty because I managed music via iTunes, so when I deleted an album the folder is empty but the JPG cover is in there, and some other files as Lyrics files, and so on...
I need a Rule that detects if ALL the files are not mp3 (or NONE of the files are mp3) and then delete the Folder. No success so far.
Right now I got:
if Kind is Folder
and
Subfolder Depth is 1
Run rules on fodler contents
And this one:
if kind is Folder and
Subfolder Depth is 0 and
Sub-file/folder Count is less than 5
Then Delete folder
The problems is some albums with 2 or 3 tracks are deleted.
any hint would be much appreciated
Thanks