Here - you can see mine pretty good in this shot:
http://www.talkbass.com/forum/attach...4&d=1115904151
See? A white one, and a black one. They're made of something that's like terricloth strands woven in with these hoops of elastic. They really work well.
The optimal muting seems to be with one right over the second fret, and one over the third.
With one up off the fretboard (behind the nut), and the other right near the nut - or even half-way to the first fret, really - you can perfectly-well play open strings - no problem (NOT open-string harmonics, though; it really kills those. I'd imagine round-wounds would sound deader, too) - but it still makes a huge difference on how clean my playing sounds.
I've only been able to find them at "Kohl's Department Store". I don't know how far out of Wisconsin they go (?). Maybe I should look into buying a case of'm or something, huh?
I use tons of gain and compression; I also very-often use overdrive - my muting has to be killer, and although I use careful right and left-hand muting (with 'floating thumb'), these still really help.
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Y'know: some say "those are used to cover-up bad technique", or whatever. I guess... But I think of it more like "...used to push the limits of the very-best I can sound". It seems to me that the other is a bad attitude, in-comparison.
Also - I've found that all-maple necks need these mutes more than basses with seperate dark-wood fretboards. The difference is pretty-noticeable to me from playing all-different basses at music stores. It also seems that neck-through basses need the mutes more than bolt-ons do. I've tapped on some bolt-on, rosewood-board basses that hardly seemed to need one at all (for TAPPING, I'm saying - I don't do super-complex tapping, and get the most out of the mutes with finger-style).
I remember a bolt-on Yamaha bass (dont' remember the model) that had freaky kind of large frets that almost looked 'bulbous', as though they were cylinder-shaped, instead of 'half-cylinders' like you'd expect a fret. It had a dark rosewood-like fretboard. It seemed to have the least 'crosstalk' between strings of any bass I've tried - you could fretboard-tap on one string, and then mute only it (the string you just tapped), and hardly any sympathetic vibration remained in any of the other strings.
Joe