These "extreme" sounds that are being requested. How often do you actually hear them in real world application?
I don't know about everybody else, but back in the day when prog rock ruled and everybody had a Moog or an Oberheim. I don't recall hearing any "extreme" sounds. Most of what I heard was comparable to the videos I just listened to in this thread.
So what exactly is the point of doing these "extreme" sounds?
I guess this is why this thread was called a "a real world test" and not "an academic test" (or something similar).
FWIW i am am no big friend of "effect sounds" that are rarely usable in tracks which is why i rarely programmed them myself.
I usually tried (and try) to do sounds that are actually playable which mostly also involves "bread & butter" sounds like e.g. Synth Brasses and Synth Strings. Those kinds of sounds could usually be used in many contexts like has been proven in countless examples in the past and synths like e.g. the OB8/Xa, Matrix 12, Jupiter 8, Prophet 5, Memorymoog, Synthex and some others were perfect for those. I also like "typical" Osc Sync sounds which were possible with most synths i just mentioned (from those i had only owned a real Jupiter 8 myself, from Oberheim i had a Matrix-1000, Marion ProSynth and a virtual analog OB-12).
Talking about "extreme" sounds on many VA synth also also real analo s i liked to do some "Acid like" sounds with high resonance while of course only a few sounded similar to a real TB-303 which is quite unique in that respect.
Also doing some Reonance sweeps in basses and pads is really nice from time to time and not just for testing purposes (while the way those sounds are done usually is sligtly different to how it is done in certain tests).