Lift the finger with energy and listen for the clear tap of the finger drop.
In the first part of this exercise the finger rests on the adjacent string before lifting, in order to hear a pure open-string sound in between finger taps. It rests lightly with harmonic touch to keep the hand flexible and open.
In the second part of the exercise, the finger rests on the same string, which prepares for our normal finger action.
Keep the bow speed constant to make it easier to hear the sound of the finger drop.