Thanks a lot, everybody!

I had half given up on trying them out when I had such difficulty setting up Pro Tools, but I tried again with Ableton Live and so far it's been working fine smile

I'm not sure, then, why Pro Tools is being such a pain, but anyway I'll try a bunch of the main ones out - including RealBand - and see which work for me. I've recently read that Cubase is used quite a lot by film composers, so I'm looking forward to trying that one in particular.

I'll most likely be back once I've given a bunch of them a try!