I don't know the answer but the faders on my Audya 76 have a long throw and seem to work as expected, although at times, I have to reset them. That is to push them all the way up and down to the desired level.
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pa4X 76 ,SX900, Audya 76,Yamaha S970 , vArranger, Hammond SK1, Ketron SD40, Centerpoint Space Station, Bose compact