You would want a vst for Win not just Mac smile
RealBand calls on RealBand\Data\bbw2.exe to generate the tracks.

ReWire RealBand/PT is another way.

There is a way to do MultiRiffs in Biab Biab MultiRiffs an Easier Way though not as easy as they could make it.

Watch https://www.dropbox.com/s/4es22n4a8gq9vku/BB-MultiRiffs.mp4?dl=0
Download https://www.dropbox.com/s/4es22n4a8gq9vku/BB-MultiRiffs.mp4?dl=1