FLAC to MP* using dBpoweramp, set compilation tag?, What's the best way to set the compilation tag? Options

[Waywisher]

Hi,

Background:
My audio library is currently, mainly, Exact Audio Copy generated FLAC files that I now want to transcode to MP4 or what ever for use with a shiny new 160GB Ipod Classic for use in the car. I've bought dBpoweramp Reference and using the Batch Converter have tried a few files to get the naming scheme how I want it. For non-compilation albums all is well. dBpoweramp isn't recognising the compilations though. Having looked into it, briefly, it appears that dBpoweramp uses the Compilation tag whilst itunes uses a similar ITUNESCOMPILATION tag - neither of which are currently set for my library.

So..

the main question:
What's the best/most efficient way of adding the compilation tag so that dBpoweramp will recognise the compilations and then the resultant MP* files will be itunes/ipod compatible?

If poss. my preference would be to use Mediamonkey (I use the latest free version at present) or MP3Tag.

Any help would be gratefully received!

Ta