Thanks for the responses. Is it possible to buy the pro version then upgrade to MegaPAK or UltraPAK, or indeed buy MegaPAK and then upgrade to UltraPAK for the cost difference, or close to the cost difference? Or is it upfront or much higher costs?

Re Mac vs PC I have Logic Pro (& obviously GarageBand) is there anything RealBand does that wouldn’t be abale to fairly easily do with those?

Thanks