no difference in low and middle d
Hello everyone,
like the title suggests i hear no difference in a low d and middle d. and I have the same issue with all the notes that use the third left hand button and the octave key. even if I play a D, G, E or F and I press the octave key while holding the note I hear no difference. I've checked and the hole that gets opened by combining the octave key and third left hand key is not clogged and seals well so I think it's me. what can i do to prevent this?