Dear (continuo-)lutenists, there are (at least) two examples of duets for two continuo instruments - only the numbered bass line written - but meant to be played as otherwise all improvised duet. The one I remembered and also found in the Net, is by G. Strozzi, see http://www.continuo.ca/files/Strozzi%20-%20Sonata%20di%20basso%20solo.pdf
There is at least one other similiar case - got also it nearly 20 years ago from S. Stubbs (if memory serves...). And it also is in my bookshelf, I know that, but I cannot find it... Anyone has any idea? Next month in a music course I might have possibility to play with a professional baroque harpist, and this kind of improvisation stuff could be most enjoyable! And I've done these two in a course in Bremen in the beginning on 90's... Best, Arto To get on or off this list see list information at http://www.cs.dartmouth.edu/~wbc/lute-admin/index.html