The switching is the easy part:
1) Get a hotkey-compatible KVM switch (2 or 4 port depending on how many consoles/PCs you need) with Audio support, the IOGEAR ones are the best in my experience.
2) Andy's XBox and PS2 adapters use output from a standard PC keyboard cable from your I-Pac. Run your I-Pac cable into the keyboard input on the KVM, then run a keyboard output to each PC/ console adapter. Likewise, hook up the video and audio from each PC/console to the KVM.
3) Use the I-Pac utility to remap one of your CP buttons to Scroll Lock (or whatever hotkey your KVM uses, Iogear brand uses Scroll Lock). Now double clicking this button will switch all audio, video, and control inputs to the console or PC of your choice! (You will need to use a button that is not commonly used, and perhaps place it on your cab so that it is not accidentally hit, like on top of your cab.)