I am trying to learn Sober by Tool. A big chunk of the song is a down up picking motion across all 4 strings with your 1st finger on 5th fret A sting, and pinky on 7th fret G string. D and D strings are open (drop D). Once you do the down up you mute with your fret hand, but I am still getting some noise/reverberation when I try to mute. How do I get better at this? How much pressure is required so that all sound stops when I mute?