Lee:

If you go to www.yamahapkowner.com

you will find some DVD's Eileen sells. I'm n not sure if they address the voice tuning but they do address Tyros operation and use.
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joesax
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https://music4stressedoutsouls.bandcamp.com/
Tyros 3, Motif XF6, Quad Amp/Pre-Amp/DAC, Quad Monitors, Tascam Digital Recorder