I have a 970, Audia 76, and Pa4x as my main boards. Unfortunately, the SD40s haven't reached Florida, so I have to rely on demos. However, I am sure the SD40 would be a great compliment to your S970 in terms of orchestral leads, as well as styles.
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pa4X 76 ,SX900, Audya 76,Yamaha S970 , vArranger, Hammond SK1, Ketron SD40, Centerpoint Space Station, Bose compact