I'm contemplating getting one of my cousins the Yamaha MU15. She's got a digital piano with lousy voices. Hopefully, by attaching an MU15 to the piano, she will get much nicer sounds. The thing is that she mostly plays classical (a little jazz as well) so what is most important is that the piano voices be good. I would also like to know if it's necessary to run it through a computer, or if it would be directly attachable via a MIDI cable. Any thoughts on the MU15 are much appreciated.