[sdiy] Yamaha CS-50 high pitched voice

[doof]

Hi all,

I recently acquired a nice CS-50 cheaply, but alas the voices are not completely in tune (surprise, surprise).  Is anyone here familiar with the tuning procedure? I've found the CS-80 procedure on the web but I'm not sure how applicable it is to the 50.  The particular symptom that has cropped up is that the fourth voice has an extremely high pitch when played.  Any ideas/pointers?  Thanks.
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