I have a 1964 recording of Bach's Two and Three Part of Inventions in which the piano emits an audible double-tap hiccup/echo throughout the middle register. I

I have a 1964 recording of Bach's Two and Three Part of Inventions in which the piano emits an audible double-tap hiccup/echo throughout the middle register. It is pretty maddening. If I recall correctly from the CD liner notes (remember those!), Gould apparently loved the character of the piano and how close it was in character to harpsichord so much that the hiccup was somehow alright with him. Which is completely bizarre to me because it sounds like such a huge and obvious "bug". I wonder if Edquist worked on or had an opinion on that piano.