Hey!
You can control the Ketron SD 90 together with the Korg PA 700. There should be no problems at all. I control my SD 90 from Korg PA4x, or Yamaha Genos, and Ketron FS 13 pedal.

/fozzie
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Ketron Audya-76, Ketron SD 90, Ketron SD1000, Yamaha Genos2, Zoom R-24, Zoom H2n, Guitars, Amps, Band in a box 2023 audiophile, Ipad PRO with Auria and iConnect AUDIO4 interface, etc. etc.