Omni mode in FL Studio allows you to set up one knob to control the same parameter off similar channels. Use it with Pickup (takeover mode) for a decent hands-on FL Studio mixing experience.
How to control multiple knobs with one knob from a MIDI Controller. (Linking multiple parameters to 1 knob in FL Studio).
How to remove and delete links mapped to your knob or slider in FL Studio. Reset a MIDI Controller's Knob in FL Studio.
How to use Multilink to Controllers in FL Studio to map knobs and sliders on a MIDI Controller to VST Parameters fast.
Project Links vs. Global Links in FL Studio when Mapping Knobs to VST Parameters. (Project Links are Orange, Global Links are Blue, Unassigned is Green)
How to map knobs and sliders in FL Studio. Linking external hardware controllers to VSTs in FL Studio (Stock and Third-Party Plugins)