Which also leads to which instruments work well together or don’t, if your layering any instruments in your registrations. What effects if any are needed or what effects were available for that style of music.

With the Big Band Registrations would you use no reverb (dry) or some.
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Gem Wk4, Solton Ms60, Technics Kn5000, Korg Pa50sd, Yamaha Psr k1, Tyros 4, Korg Pa700