Doc,
You can't go wrong with a used PSR-3000 or a new S900--either one will do a great job, and when he yells out country rock, G, with a tempo of 142, it's just a single button push away.
Good luck on whatever you decide upon,
Gary
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Travlin' Easy
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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.)