DJ cable for iPhone / iPad?

[p3eps]

I've noticed Griffin do a DJ Cable for iPad / iPhone / iPod Touch - which essentially lets you listen to something different on the headphones than what's coming out of the speakers.

Has anyone got a diagram on how to wire one of these up? I have all the bits at work for making one up - and would like to have a go rather than forking out the £20 for the Griffin one.

Much appreciated...

[p3eps]

I figured it out myself by plugging in a set of ear buds and turning on the cable split option in DJay.

One earphone plays the output and the other plays the cued song.

I wired up a cable yesterday with some bits I had lying about and it works perfectly. £20 saved - and I won't feel bad getting fed up of it after a few hours since I didn't have to pay for the cable!!