There seem to be three options. (A) Killing the sound with only the right hand, having the index or middle finger mutening the string while the other is plucking it. Or (B) making the the “umpf” between both hands, having the left dampening the string while the right hand os plucking. Or is it (C) Using another string, best above the actual note that is going to sound next? Does the chosen technique cause any difference for the sound? I tend to believe that comfort and speed are the only important factors. I used to switch between (B) for the G-string & (C) for the rest as this came kind of natural to me. But becoming aware of (A) recently I’m considering to adapt it as it promises to be faster. Rufus Reid has a great way of using this device. Any insights “how he does it”?