If you are thinking of buying anything to do with computer music on the Internet, be very careful before you deal with Computers and Music (computersandmusic.com).
They have no fixed abode, no telephone, and do not answer emails.
If you order anything from them, be prepared to wait in ignorance of whether your goods have been despatched or your credit card debited. I know - I'm in that situation. After a month of waiting I have cancelled my order but still they do not reply.