Steve, they have trouble accomplishing that in a full-blown studio with thousands of dollars in software and other equipment. A lot of the basic stuff can be done on the Arranger Keyboards, but it's a lot more work to accomplish the same goals.
Good Luck in your search,
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.)