Does anyone know what I need to hook up a gutted xbox controller to a control panel? Ie : an ipac or Whatnot
Also, can I use an analog joystick with this setup?
If you're referring to using a hacked gamepad, the hacked gamepad
is the encoder -- no need for an IPac or KADE.
If the hacked gamepad has analog controls, you should be able to use it with a compatible analog joystick AFAIK.
If the gamepad connects to 2 tabs of each potentiometer, they are wired as variable resistors -- you
must get an analog joystick that matches the resistance value range of the original.
If the gamepad connects to 3 tabs of each potentiometer, they are wired as voltage dividers -- the resistance values are not critical as long as the voltage range on the center tab of the potentiometer is similar to the range of the original.
Just to be sure, please post the details about the controller you plan on hacking and the controls you want to connect to it.

Scott