This is just a peculiar characteristic of some of current Yamaha Arrangers. The Registration is saving the edited voice, but the registration memory is seeing the preset voice first and then seeing the edits. It overwrites all of the old data with the new, except for the voice name. Check it out, it's a minor annoyance, but it works fine.

Regards,

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Steve Deming
Assistant Manager
Customer Support Dept.
Pro Audio & Combo Division
Yamaha Corporation of America
YCASupport@yamaha.com
714.522.9000