After much research, I decided on Axiom61 for my B4'2 and other software in my Receptor.

An excellent controller with a good feel.
http://www.sweetwater.com/store/detail/Axiom61/
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pa4X 76 ,SX900, Audya 76,Yamaha S970 , vArranger, Hammond SK1, Ketron SD40, Centerpoint Space Station, Bose compact