Engine Sounds effects Controller Design

[Flash]

Hello,
Just tossing this out here to see if it is possible and how to make it possible.

I see Tamiya RC truck company makes a MFU Multi Function Unit.

It controlls LED lights and Sounds of engines that are proportional to the RC remote stick to replicate engine sounds.

here is a video demo.

YouTube - TAMIYA HILUX HIGH-LIFT

Is this something that can be made myself?

any idea's on how to?

Not the LED controls, Just the Engine sounds.