Does anyone know how good the iBook is for playing MIDI live? Is there any significant lag? I have an M-Audio Keystation 88es, which plugs in directly via USB. I will then use a mini-stereo to mono cable to plug the laptop into an amp which will power the speakers (or through a PA). Will this sound fine if the iBook is set at half volume and I use the amp to do the rest? If not, am I able to get a better internal sound card or do I need to use an external one? Cheers. ps: as I understand it, processor speed is more important than RAM for MIDI, but RAM is more important for movie editing etc. (which I will also be using the laptop for, be it iBook or Powerbook). Is this correct?