Sorry for the flaming yesterday, if your still interested your best bet would be by using a kaoss pad. They are the only device I can think of with midi out. However the KP2's which were around £150 are now discontinued and the Kp3's are around the £250 mark. I think that's a too expensive price to pay for something to make a funny noise. If you want I can upload a video of what it will sound like if you do it though to prove it wont sound as good as you think.

There is a video on my channel now showing what a whammy will sound like on the detune setting being controlled by a xy.