Diki, that's why they have a hold feature on the left hand so the player can lift his or her hand and use the pitch bend, push buttons, etc... Guys like Don Mason are a treat to watch perform, mainly because his left hand only touches the left hand chord for a fraction of a second, then it quickly goes to the pitch bend device for his guitar emulations, which are absolutely incredible.

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.)