Multidisc help

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Hello

I am presently trying to rename my individual discs in my multidisc albums by using the DISCSUBTITLE tag but I cannot find the field in mp3tag. The nearest I can find are SUBTITLE & SETSUBTITLE, which I have tried but this does not seem to be working as the named discs are still 'Disc 1', 'Disc 2' etc.

Also I cannot find in the guide if I need to change my minimserver settings so this will work. The user guide seems to say if you enter a value in the DISCSUBTITLE tag it will just work.

Thanks as always for any help given.