The iPhone’s glass touchscreen may be a thing of beauty, but despite its multi-touch capabilities, it would seem this device is incapable of responding to how hard you tap it. But the developers at Wave Machines Labs apparently didn’t want to take no for an answer.

The iGOG drum suite for iPhone provides drum pads and sample triggering in unique ways, most notably in its velocity-sensitive VelAUcity. How do you get velocity response from a device that’s supposedly not pressure-sensitive? Presumably there’s additional data in the touch events that makes this possible, but for now Wave Labs aren’t saying:

iGOG’s proprietary VelAUcity technology does the unthinkable and turns the iPhone’s screen into touch sensitive drum pads. Play loud, play soft, or play a full-blown crescendo on a crash cymbal, iGOG will capture every nuance of your performance. Just plug in your headphones and start playing.

Here’s the interesting twist: generally, when any of us say “iPhone,” what we really mean is “iPhone or iPod touch.” That’s not true in this case: “NOTE: VelAUcity is only available on iPhone devices. if you’re using an iPod Touch, VelAUcity is disabled.” That seems to suggest that the trick is the built-in mic, or at the very least some private API that’s iPhone-specific. (Audio triggering is most likely, as this app comes from a developer with drum replacement experience.) That would also suggest to me that you might be able to pull this off with non-Apple mobile devices and controllers in the future.

As a result, though, I can’t test it – I have only the iPod touch.

Unconvinced or uninterested? iGOG has some other approaches to how the small Apple handheld can be made more useful as a set of pads: