Trouble switching to second octave
Here I started on low Ab and added the first octave key. It first refused to switch; then it started warbling between the two octaves when I used more air and finally with even more air it went to the upper octave but with an undertone of the lower octave. This happened with three different reeds and I dried out the octave vent with paper. Does this sound like a clog in the vent or something else?
Also this happened to some extent with most of my notes that use the first octave key with increasing severity as it approached Ab