Does the recorder (at least the treble recorder) really require you to stand on one leg from time to time in order to bring your knee up to the bell in order to reach some of the highest notes like F# or A? It seems like you could get a bit unbalanced when playing. How many recorders feature a bell key? I had a look online and saw the Dolmetsch seemed to have invented one, but it doesn't seem to be widespread at all and doesn't regularly feature on other makes. How do people manage to reach the high notes? Do you just accept you have to do a balancing act as part of your playing?