Um, yes, an Arduino, of course! You send the PWM signal FROM the RC Transmitter channel of your choosing into the RC Receiver, pass that signal INTO an Arduino, manipulate the signal as needed in your Arduino sketch, and send the modified signal (or even the same signal) OUT of the Arduino on multiple channels to your servos.
You will need to supply power externally on some voltage regulator (buck converters work well) to the servos, just the yellow/orange signal wire will go from the Arduino to the signal in on the servos. Don't forget to connect ground from your power distribution (buck converter, voltage regulator, whatever) to the Arduino as well or it won't work.
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