I tried this naming string today, just changed the "Compilations" value to "Various Artists" and removed "- [artist]" from the file name:
[MAXLENGTH]240,[IFCOMP]Various Artists\[album]\[IFMULTI][disc].[][track] - [title][][IF!COMP][IFVALUE]album artist,[album artist],[artist][]\[album]\[IFMULTI][disc][].[track] - [title][][]
This worked fine, but the ripped tracks started at 01 for each disc in a multi-disc set, i.e.:
1.01 - Railing *1
1.02 - Brown Paper Bag *2
...
2.01 - Intro *1
2.02 - Hi-Potent *2
...
I fixed this by going into Mp3tag and using the "Auto-numbering Wizard" tool, as I was unable to find a way to do it with the free version of PerfectTUNES. The result looked like this (highlighted column):
track_number_01.jpg
I didn't change the total number of tracks for each disc as this was just a test (hence 1/13, 2/13... 14/9, 15/9, etc.).
Does the full version of PerfectTUNES enable this type of auto-numbering of tracks in the same way as Mp3tag? I had planned to purchase PerfectTUNES along with dBpoweramp when the free trial runs out. Also, is there a way to work around this problem via the naming string?