Actually, Yamaha does have this feature. Merely press the + and - tempo buttons at the same time and the timing will revert to whatever the original tempo of the style is. It's that easy.

Good Luck,

Gary cool
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!

K+E=W (Knowledge Plus Experience = Wisdom.)