"Air Melody is easily one of the best sounding and in my opinion, most playable theremin simulators available for the iPhone." - Theremin world (Jul/19/2010)"Playable" is the most important feature on this app. You can find videos for understand how to play a melody on YouTube. You can search by keyword: "skipnotestudio".Range and tones of "Air Melody Lite" are limited.How to play:1. Tap "" icon.2. Tilt your iPhone Rotate the black wheel3. Enjoy with your favorite music in your iPod library.If you push "" icon more than 1sec, You can select tones, scale modes.In case of change the app, If volume level of iPod music is low, re-tap the play/pause button.