Actually though the USB offers a chance to make a hardware synth that would be no more intrusive then a set of headphones. Already the bigest thing about most synths is packaging and the speaker. And I would hope that you would be looking to use headphones while on a flight. All the same, software synth is a good idea and would serve many people well. ======= Kirk Wood Cpt.Kirk at 1tree.net Nothing is hard if you know the answer or are used to doing it.