For what it's worth, a long time ago I build up an accordion on a piano to operate from "O" rolls. Later, after hearing a "G" roll playing a piano & accordion that a friend of mine, Carl, in Wisconsin built up, I decided I personally preferred the "G" roll version so the next two that I made used "G" rolls. I'll probably build up only one more as I'm down to my last 65-note piano, a 1910 Auto-Piano. I do have some files of my friend's "G" roll player available for download on my web site if you'd like to hear them. Click on URLs to hear it: http://www.modempool.com/haldavis/groll1.zip http://www.modempool.com/haldavis/groll2.zip http://www.modempool.com/haldavis/groll3.zip http://www.modempool.com/haldavis/groll4.zip http://www.modempool.com/haldavis/groll5.zip http://www.modempool.com/haldavis/groll6.zip http://www.modempool.com/haldavis/groll7.zip http://www.modempool.com/haldavis/groll8.zip You just might like the sounds of this piano made by my friend in Wisconsin. Hal Davis Leslie, Michigan