I don't know if you have been here
http://www.keyboardcity.net/ketron-sd1.htm but I made recordings using exclusively the SD1.
I demo'd sd1 professionally for 3 years for Ketron.
Dan O'
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Ketron, Yamaha, Casio,Korg
http://www.baltimoremusiccenter.com 1-866-348-8876