iRing helps musicians control iOS music apps with their hand

If you're making music on an iPad, iPhone or iPod touch, have a look at IK Multimedia's new iRing. It's a gadget you slip on your finger that tracks motion. You use it to control music apps with hand gestures. It costs $24.99. This isn't a ring you wear on your finger. It actually goes between your fingers. It's double-sided, too. One side is printed with a pattern of three dots, and...