I’ve always felt that Yamaha and Roland were a perfectly matched pair. It seems the strengths of one covers the weakness in the other, and in many categories, BOTH have really excellent but different sounds.
So if you are into layering things, strings, horns, woodwinds etc., you can be assured that not only are both sounds good, but they are based on utterly different samples, with different sample crossover points and velocity crossover points, which leads to a really interesting and evolving sound as you play dynamically across the keyboard.
It’s a great way to put a realistic orchestra or big band together where any slight flaws in one are covered up by the other… With the benefit that you’re not chewing up polyphony in one keyboard layering a bunch of stereo stuff..!
The icing on the cake is that you can probably get one keyboard to send the PC# to the other keyboard so BOTH setups are called up in one go.
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An arranger is just a tool. What matters is what you build with it..!