Leaving %discnumber% blank for single-disc albums?

[simoncn]

It is fine to omit DISCNUMBER and TOTALDISCS from single-disc albums.

You could use a tag update file to remove DISCNUMBER from albums with TOTALDISCS=1. The requires the following lines in your tag update file:

@DISCNUMBER=1
&TOTALDISCS=1
-DISCNUMBER

If you also want to remove TOTALDISCS in this case, you need the following:

@DISCNUMBER=1
&TOTALDISCS=1
-DISCNUMBER
@TOTALDISCS=1
-TOTALDISCS