Hi Dave,
I'm at work right now (hospitals don't close on the weekend...sigh..), so I can't fiddle with the harmonizer to answer your question, but I posted a message on the german PSR-9000 forum, wich has a lot of dedicated yamaha people. Hopefully we get a positive answer. I'll let you know.
Eric
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Genos, PSR-S970, TC Helicon VoiceLive3, Mackie 802-VLZ3 Mixer, 2 Bose L1 Pro16, Electro-Voice ZXA1 Subwoofer