There are two major parts to the application. The first part I will discuss is the firmware and hardware. This includes the Arduino and another board we will use to supply power to the servos. It's important to isolate the servo power supply from the microprocessor power in case the servos need more current than the battery can supply (imagine all 12 servos stalling at once). If the power supplies are the same you could have a brownout condition on your microprocessor depending what type of power supply you are using. I will also show you the firmware required to run this application on the Arduino.
In the second part I will discuss some simple software that will allow you to control the firmware through serial commands. This software provides an interface to the Arduino firmware to control the servos, save servo start up positions, even record a series of positions, or frames, (of all channels saved at once) to playback in sequence when desired. The software is .Net based so make sure you have the latest .Net framework installed. I will be supplying an installer and source code.
Here is a video demo of the project: