You are trying to trigger Active & Bypass with MIDI Notes. These are not supported in the H90. You will have to use MIDI CC messages, if that’s possible.
I’m not familiar with the Xone 96 capabilities. A workaround might be translating MIDI Notes to MIDI CC, using an ‘event processor’, but that will require more hardware / software in the MIDI pipeline.
I knew I had run across the Xone 96 at some point [Elektronauts]. That’s one badass mixer, if a bit too RCA / DJ-centric for my own use. I had no idea what the MIDI implementation might be. Glad you got it all worked out.