I can think of several synths that operate completely on the surface, and some that are *mostly* on the surface. First, Moog Voyager or Little Phatty. 100% analog good times. For something a bit more "outer-spacey", look at the Dave Smith offerings, including the MoPho keyboard, or my favorite, the Mono Evolver. About 90% surface control, and a few random menu items that are easy to locate and tweak.
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bassist turned synthesist
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