> it seems to always keep the 320kbps mp3 which in theory is great however some of the duplicates that are 192kbps or higher often have 100% rating and sound much better than the 320kbps version which may only have a rating of 79.5?
Data rate alone unfortunately is not always a good quality criterion. Sometimes higher bit rate files (e.g. 320) are just recompressed versions of lower bit rate files (e.g. 128). Their quality of course can't get better, only their size increases.
This may be detected by the rating and audible perception.
