Very low C# is ok and I'm able to play all the opposite notes around the horn in tune with out an issue. I'm able to carry middle C# nearly tune While using the octave critical and G vital and C# earlier mentioned the staff by utilizing the octave essential https://d-flat-dorian-scale-on-sa86273.activablog.com/26412731/everything-about-play-c-sharp-dorian-on-alto-saxophone