Uh oh.

It used to be that bumping the version would blow everythign away and rescan. But then you'd lose data about song ratings and number of plays.

So now bumping the version doesn't do anything unless you provide an updateRecord() function.  You can probably write one without rescanning all of the files.  Just use the existing metadata to construct the filename you want and save the blob in the metadata to a file and delete the blob then return the modified metadata object.

I have not done it myself though...