[Marc]

May I ask, which one precisely?

I am going to place a bet of € (or $) 0,00 on an organ recording.
(That's how sure I am.)

 

[Marc]

Did Karl Richter ever play any other instrument?

He was also a conductor.
Made many choir recordings, a few of his Bach and Händel recordings became quite legendary.
I got to know the Brandenburg Concertos with a Richter recording.

But he earned his first fame as organist indeed.

 

[Marc]

He actually made multiple harpsichord recordings (including another Goldberg Variation from the 50s) and was the harpsichordist on both his recordings of the Brandenburg concertos.

I'm so used to the combi organ/harpsichord that I sometimes tend to forget to mention either one of them.

(I bet he played a little piano, too... but I don't recall any recordings. )