I stopped using two keyboards 20 years ago - just didn't make sense. My top tier on the stand is reserved for my custom console, which makes life a lot easier for me while on stage and provides lots of options if the keyboard were to fail, which I never has in all those years.
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.)