Re: Beginner problem playing D on saxophone
You have two octave vents. One is the hole on the neck. The other is on the body, up closer to where the neck goes into the body,
Your wedding ring finger activates the body vent to open and the neck vent to close.
When the octave key lever is depressed.
So, when playing middle D, activating the octave key with the left hand thumb, that is what is pictured, the neck vent will be closed and the body vent will be open. If you lift your ring finger, it will flip to open the neck vent, and then back as you press the key down. If this is not happening, you need a minor adjustment from a technician.
Good Luck and stay at it.