That’s quite a challenge, as most poly synths have memories. Quite a number have modulation matrices in a screen menu. The UDO synths don’t have a screen and the modulations are easy to set up, but not easy to reverse engineer afterwards, as you can’t ‘see’ what modulations have been set up. However on any synth, if you set the modulations once, then leave them alone, you’ll avoid all of this. The Juno does so by offering very little other than envelope and LFO for modulation.
How about finding a synth that you like the sound of and look into whether you can treat it as you’ve described? A few have been mentioned with manual modes; pick up or latch mode on knobs and sliders can help; if it has a mod matrix, you could set it once and ignore. You might need to remember to save the one preset each time you power down, then on next power up the synth will be pretty much WYSIWYG.
That could open up the field to a big range of knob / slider encrusted synths.
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