I see that Stephen Woodward has posted as recently as this April –
https://www.edn.com/design/analog/4...er-simulates-log-taper-to-accurately-set-gain
https://www.electronicdesign.com/author/W. Stephen-Woodward
I suggest that you contact him (thru EDN?, or referenced alumni associations)!
Good luck!
P.S. I am intrigued, and saddened, at the loss of such history on the web ...

 

I doubt if your ears are matched as closely as the circuit you're looking for. I think you're paying more aattention to the delivery system, when you should be paying attention to what's being delivered. Sit back and just enjoy the music....