Fully automatic E/F mechanics
This mechanism will add 2 resonance keys to the lower part of the instrument that will be open when you play the lower notes. When you operate the register key they will close automatically. The advantage is that your low E and F will always be high enough without compromising your B or C above. You don't have to relearn anything in your technique. The system will take care of everything. With this added mechanism, the instrument will become slightly heavier.

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