I didn't know that big difference between SD7 and SD40. Price wise there's not much big difference between the two. I hope I'll not be disappointed with the SD40. Thanks friends for the information.
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Jim

SD90,Korg I3, KMA Liverpool,TC Helicon Play Electric, Fender Sonoran Guitar, vArranger, Bose S1 Pros, Bose L1 Compact, Aiwa Exos-9