First version, with large decoupling caps and lots of filtering, I think I got this design from the Fat Controller (http://burnit.co.uk/sdiy/index.php?page=fatcontroller)
Then a minimal, DIL14 version that just includes the S&H caps in the same space a normal TL074 takes. Sort of a drop-in replacement for a TL074, almost.
And finally an alternative version with slightly different routing. Not sure what will work best in practice so I made two variants.
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