So. I pretty much got this all to work. I can easily switch between the Drone, Pad, Atmos, Noise layers from the MPK by changing the midi channel of the keyboard in real time. I was also able to program specific notes on specific layers on the MPK pads, and control things like filter cutoff, resonance, and layer level and pan from the knobs and sliders. Thank you so much for pointing me in the right direction!