From the website:
Depending on your point of view, this update is either a saving grace or complete sacrilege. Some of you will appreciate the chance to play the gamelan instruments in western tuning, and some of you will just ignore this version and tell us we’ve sold out. Nonetheless, in fairness to all the different types of musicians out there, here is a Gamelan Set tuned to western equal temperament.
Visit the Balinese Gamelan website for more information.