Originally Posted by timrhealy
Wanted to just buy just the piano samples from Reason. Do i buy the reason software in order to run the refills?
Yes, a ReFill is like an expansion card for Reason, containing patches and/or samples. You could compare this to a ROM expansion card that only works for a certain hardware synthesizer.
Also worth noting is that there is no official support for running Reason Pianos Refill on Reason Essentials, as far as I know. Some of the patches might work but I don't think it's recommended nor supported by propellerhead officially.