Miden
I thought you may have hit it for a moment, but alas,sequencer is not on the list of Assignable Pedal and Slider Assignments. It must have been one of the cuts, present on the flagship models.

Thanks
Bernie
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pa4X 76 ,SX900, Audya 76,Yamaha S970 , vArranger, Hammond SK1, Ketron SD40, Centerpoint Space Station, Bose compact