Jim, when I used a mixer, it was positioned on the left side of the keyboard and held in place with a special rack I designed just for that purpose. I had instant access to it, and no one but me could see it.
Gary

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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.)