I made one that fit on the keyboard stand where no one could see it, but it was very easy to access with your right hand. You can find details on how I made it on the PSR Tutorial dot com site.
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.)