Modulation wheel use with 2 keyboards

I’m using 2 keyboards assigned to a different plugin each. When playing a drone sound on the upper keyboard and an arp on the bottom one, I want to use the modulation wheel to alter the sound on the bottom keyboard but the drone sound gets altered also. How can I avoid this so that the modulation wheel only affects the sound played on that keyboard?

Please post a picture of your wiring view

Also, you mention you want to use the modulation wheel….but which one? Do you have one on each keyboard?

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