casio tonebank keyboard ct 680

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I have just inherited the above keyboard, but unfortunately there is no operating manual with it. I want to make full use of this keyboard, so does anyone know anywhere I can get hold of one? I know this is an old instrument & may no longer be available, but if there is a manual anywhere which is very similar, I would be very happy. Perhaps if someone has one, it could be scanned & sent to me by e-mail.