This full score for Bach's St. Matthew Passion helpfully has the figured bass written below the continuo part. I found this particularly illuminating, as it helped me to see the harmonic movement which is "blurred" somewhat by the chromatic alterations in the contrapuntal lines. (A first read through, using a piano reduction in a vocal score was pretty unedifying!)
However, this autograph (?) manuscript doesn't have the figured bass. And I couldn't find figured bass on any Bach original scores I found online. So, I just wondered if Bach did put figured bass in any of his scores? Or in the continuo parts? Or would the continuo player have used the full score, written the figured bass in themselves, or just listened to what was going on in the other parts?!
The main reason I'm interested, is because I presume the figured bass in the score I link to above has been added by the editor, and due to the chromatic alterations in the instrumental parts could have been interpreted in a number of slightly different ways. Would baroque compositions have had a "definitive" figured continuo part?
BTW, I already looked at this post and its answers.