DOOD!! None of those clips I posted demo'ed different chips, i.e. IC's or "opamps" as they're often called. The point was to show the ZYS's switchable features--two gain ranges, three clipping modes, and three different bass cuts.
BUT FEAR NOT!! For lo, the ol' Voodoo Man has that one covered, too.
I made a couple of clips to demonstrate the differences (subtle though they are!) between 6 popular opamps, including 5 that the GearPage guy did plus one he didn't include. I posted it
HERE at the BYOC forum back in early Feb.