I was looking for an example of this etude for one of my students and found something via our good friends over at Siccas Guitars! Julia Trintschuk plays Opus 6 No. 9 by Fernando Sor on a 1924 Hermann Hauser I. This is a tricky little etude with lots of left hand challenges to navigate and Julia does a fine job.
Sheet Music: Complete Sor Studies for Guitar (via Amazon)
Video Link & Source: https://youtu.be/V-nfRJQ1y9U