The third piece by Karges from manuscript Am. B340 is a piece called Capricio. Only the first half is (probably) written by Karges. The second half of the Karges' Capriccio is actually written by Froberger. It is the second half of Froberger's fourth Fantasia ("sopra Sol, La, Re"). Karges' first half is based on the same notes as Froberger's second half, and both parts blend together to form one coherent whole.
The recording was done with the Hauptwerk software and the sample set of the Eisenbach organ of the St. Bartholomäus church in Friesach, by Piotr Grabowski (https://www.piotrgrabowski.pl/friesach.html)
Score available here: http://partitura.org/index.php/wilhelm-karges-capriccio/