RE: 5945 beeping
In a pull-pull installation you should not realize the buzzing and as you noted it appears once a control input is garnered. Your beep is the buzzzz I describe I'm sure. It’s the nature of the beast; digital servos beep or buzz resisting loads. Additionally if your pull-pull is setup incorrectly and is loading the cables when moved off center the noise is expotential.
If the buzz is intolerable you can reprogram the dead-band for less noise. Hitec will do this for you free of charge or someone with a programmer can as well. Some Hobby Shops have a programmer available for customers to use in house.