I had very bad experiences with the Alesis Photon. The 1st one didn't work at all and the second one had one knob that didn't work and one key that made a very loud clikcing noise. I traded it in for an Edirol PCR-M50, which is superb!! Way better keys and a lot of nice features. The one thing I liked about the Photon was that it had knobs you could turn infinitely.