Hi, Im just going to buy an electronic keyboard to use with GarageBand and Im fancy buying Yamaha PSR K1 or Yamaha ZE 250i (I just dont like M-Audio and I like one with buit-in speakers.) Any idea whether they (either one) are compatible or not? Dose anybody has any experience using one of them? Do I need to install any driver for them? Help/suggestions are truly appreciated. Thanks in advance.