Has anyone worked with the method book series Technique de la contrebasse by Bernard Salles? I have never seen it anywhere and I can't find any previews online. According to Gaelen McCormick it is supposed to "fill in missing elements of the standard pedagogy", or what was standard pedagogy in the late 90s. Might be interesting for some students, but I am not going to buy it without a preview or hearing from somebody who has had some experience with it.