Have you considered a new keyboard instead with a much better VH unit sv the Yamaha?.....like the NEW KORG line of arranger units? Pa3x, Pa900 etc,.....otherwise aside from rack units take a look at some of the TC Helicon stand alone or the Roland VE20.


https://www.youtube.com/watch?v=eOL18Dhgvjo

http://www.tc-helicon.com/products/