Scott,
it all depends on numbers. For a manufacturer to design and build a keyboard targeted for a specific market it takes more than a reasonable hope to sell a number of keyboards large enough to justify the investment. How many keyboards could Ketron sell on the Far East market (China, Korea and Japan?)
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Korg Kronos 61 and PA3X-Pro76, Roland G-70, BK7-m and Integra 7, Casio PX-5S, Fender Stratocaster with Fralin pickups, Fender Stratocaster with Kinman pickups, vintage Gibson SG standard.