German startup Algoriddim today announced the launch of Djay 2 for iOS, a completely re-engineered version of its immensely popular DJ app. Its most impressive feature, HD Waveform, analyzes every song in your library and color codes important parts of each song so it's simple to hop between chorus and verse as you're mixing. As with with Traktor DJ for iOS, you can drag, scratch, and tap on the waveforms for different effects. If you look closely, you'll notice that the actual waveforms are mapped onto the surface of the vinyl as well. "Skeuomorphism can be a design element — here it provides a tangible benefit," says Algoriddim CEO Karim Morsy.