Time wasting tech: how to get Star Trek sounds out of an iPhone

Some things are just made to appeal to weirdy beardy nerds. Take the 'musical' instrument invented by the Russian nutter Leon Theremin in 1919 for example. I say musical, but anyone who has ever listened to the sounds coming from this truly bizarre combining of metal antennae and the hands of the player will probably agree that an old saw is just as melodic. The instrument in question was used one hand to control the frequency and one for volume. It's all very clever stuff, I guess, if watching someone move their arms around like a bad magician on a bad trip while producing sounds suitable for use in bad sci-fi b movies and precious little else are produced, is your definition of clever.