You can MIDI a P-105 into an S950 (or even a T4!) and have it mirror what is up on the 61 action, can't you...

That would give you basically a CVP-609, for about $7000 less ($5000 less for the T4 combo), wouldn't it? LOL

It is obscene, the markup on the upper end CVP's.
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An arranger is just a tool. What matters is what you build with it..!