Until a few years ago, I thought standing was the only way to go. I did it for more than 40 years, but about three years ago at the end of a double where the jobs were about 20 miles apart, I decided to use a keyboard stool and situated the keyboards and music stand so I was sitting sideways to the audience. I've been doing it ever since, and while I would prefer standing, at my age by the end of the night I would need help walking to the van. Fortunately, retirement is somewhere in the future. In fact, my wife says I can retire three days after I'm dead. Standing's OK when you're young, but sittin's a lot easier when you hit Social Security age.
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.)