I created a new plugin called XMidiCtrl for X-Plane. It's free and open source! If you own a MIDI controller, you may want to look at it. Using the Behringer X-Touch Mini
Behringer | Product | X-TOUCH MINI
Behringer X-Touch Mini
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Amazon.com: Behringer X-TOUCH MINI Ultra-Compact Universal USB Controller : Musical Instruments
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Behringer X Touch Mini | MUSIC STORE professional
Amazon.com: Behringer X-Touch Mini : Musical Instruments
Behringer | Product | X-TOUCH MINI
Behringer X-Touch Mini – Thomann United States
User manual Behringer X-Touch Mini (English - 8 pages)
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Overlays for Behringer X-Touch Mini - Taktility
Behringer | Product | X-TOUCH MINI
Behringer X-Touch Mini – Thomann United States
Behringer X-TOUCH MINI Ultra-Compact Universal USB Controller
Modifying An X-Touch Mini For Rack Mounting | Mixer Jaëxx