<span style="background-color: rgba(255, 255, 255, 0);">No mixing required. Both flap servos to different channels. Both channels controlled by the same aux channel, and assign that channel to a knob, or slider, or switch or whatever you want. Adjust direction in reversing menu and endpoints so they don't buzz. Done in less time than it took me to read this whole thread and post this..... </span>