Low C# is ok and I am able to play all the other notes within the horn in tune without a problem. I am able to convey Center C# up to tune With all the octave essential and G critical and C# earlier mentioned the workers by using the octave https://c-sharp-dorian-scale-on-s75207.nizarblog.com/26780477/play-c-sharp-dorian-on-alto-saxophone-options