Thanks solidrock for that. I thought I was on the right lines, but getting it to work is a different matter.

I've just tried just re-installing one realtrack set into a different folder on the PC and I'm using FormatFactory to convert the *.wma to *.wav at the moment. Once I get time this evening I'll attempt to move the whole realtrack set over to the Mac and see if everything works.

I've just replaced the DVD on my Macbook with a 1TB Hybrid drive grin , so now I'm not as worried about running out of space. If I can do one set of realtracks I should be able to do the rest.