It is a given that Glenn Gould used to give great clarity to the counterpoint voices. This is certainly true, in the sense that the listener can easily follow the horizontal lines with ease. No confusion at all! No need to forget the melodies and just sense the verticality here and there! Everything is very well explained.
But...
I have a serious complaint about his Goldberg Variation #3 (and this applies to BOTH his studio recordings!!!). He plays it in such a way that it seems we have voices divided by pitch (treble/bass, soprano/alto) in the RH, instead of only ONE MELODY being repeated one measure behind. I mean, there is no tone, touch, volume or color differentiation between any two consecutive similar phrases, as if voice 1 always sang the treblemost and voice 2 the bassmost notes.
Let me use a visual abstraction now. IMHO, the "correct", in such a "canone all'unisuono", would be to paint the main melody with color 1, let's say, blue (starting at measure 1) and the 1-measure-delayed repetition (starting at measure 2) with color 2, say orange. This way, everything which is painted blue is repeated, 1 measure later, painted orange.
Instead, what Gould does is (as I perceive it): he paints some phrases blue TWICE (in the main line AND in the canon) and some other phrases red TWICE as well.
Another thing is that, sometimes, he seems to break the horizontal line (as if he were asking the OTHER VOICE to sing some notes from the ONE VOICE).
Look, for example, measure 7: the main line reads:
D... E F# G A B... D... C#... D.............................
Gould plays:
D... E F# G A B............... (one voice)
(...) D... C#... D........................... (other voice)
What do you think?
Cheers,
Vinicius.