Pat, here is a link to see pictures and info on the EXR7.
http://www.rolandus.com/products/details.asp?catid=8&subcatid=39&prodid=EXR%2D7

George Kaye
Kaye's Music Scene
Reseda, California
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George Kaye
Kaye's Music Scene (Closed after 51 years)
West Hills, California
(Retired 2021)