In trying to find a practical way to get the thumpy muted sound for certain situations I have tried different physical solutions like foam, the Fump, and my friend's favorite muting utensil… a sock. They all work reasonably well but the problem is that it's a pain to switch between muted and unmuted. And then the problem I've had with simply palm muting is that I lose potential speed when using just my thumb. So I have started working on a technique where I mute the strings at the bridge with my palm and use the thumb and index finger as if they are each one side of a plectrum. So the thumb does the downstroke and the index finger takes the upstroke. I'm slowly getting better at it. Gaining speed and watching out for tension as the act of holding the wrist down to mute and moving the fingers can really let some tension creep in. So I'm wondering if anyone else here has used this kind of technique, knows of any legends who have used it, or have any thoughts on it in general. Thanks!