I'm curious to know if this thread is about the same type of Yamaha Sequencer which I have, the QX 21, which I still have together with the original invoice of May 11 1988 !! I paid £269 for it (app $500) which was a lot of pocket money then.
I used it only a couple of times as I remember and couldn't get used to the New Concept(?)!
cheers

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Eddie from Rotherham
www.yamahakeyboards.info

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Eddie from Rotherham
http://www.music2myears.plus.com