I've connected a Midi controller keyboard to the Midi In on my Audya 4 module then another Midi cable from the Midi Through on the Audya to the Midi In2 ( keys) on the SD90.
When I play the keyboard I can hear sound from the Audya and play styles but I don't hear anything from the SD90.

I went searching for a solution in the Midi settings on the Audya and found a SoFt Through setting under Midi. I've tried turning this on but still no sound from the SD90.

Any ideas on why this setup doesn't work?