Question: I couldn't seem to find this existing question, although it may be somewhere boiled into a two-hand tapping question somewhere else. 

I come from electric bass and the Victor Wooten style of two-hand tapping. In his method, he uses a hair scrunchie to mute the strings on the other side of the tap. To explain what I mean, fret a string at the twelfth fret and then pluck either side of the string. Then note that both tones ring out when you tap that fret percussively. 

I used a similar method on bass, but the problem was this also mutes open strings. I've noted that Antoine DuFour uses a handkerchief which is tied under the strings immediately behind the nut, which he has claimed helps with this, but I've got a suspicion there is another technique or process that you need to perform to mute the strings on the other side of where you are stopping them with either hand.

I have this problem the most on the acoustic guitar, as with electric instruments the pickup is only really working towards magnifying whatever frequency is happening on that side of your hand. On the acoustic, the other pitch very clearly rings out, and I haven't found a way to mute that or get rid of it. 

Is there perhaps a type of string material, or some kind of action setting to help with this? Are there videos where people talk about this? I can't seem to find any.

Thanks for any input.

Answer: 
Mechanically, I can think of two options:

* Put a damper on the fingerboard between the nut and first fret that is so precisely located that the string only contacts it when it is being fretted, but not when open.
* Invent a new type of fret that has some kind of damping material on the nut side of each fret so that the string only vibrates on the bottom side.

Both of these are probably practically impossible due to the standards of modern string action and the physical properties of a vibrating length of string.

The hair scrunchie (or [Michael Angelo Batio's string dampener](http://www.angelo.com/html/the_mab_string_dampener.html)) are really the only practical options that I know of. In regard to playing open strings, Wooten's approach is to either pay farther up the neck so they aren't necessary or to quickly push the scrunchie back over the nut whenever he needs those notes (something more easily accomplished with a scrunchie than the MAB String Dampener).
I haven't tried these yet, but I'm wondering whether they'll fit the bill:
Goody Ouchless Tiny Terry Ponytaile (42 ct):

[http://www.amazon.com/Goody-Ouchless-Tiny-Terry-Ponytailer/dp/B004G57GHK/ref=sr\_1\_19?ie=UTF8&qid=1366081799&sr=8-19&keywords=hair+scrunchies](http://rads.stackoverflow.com/amzn/click/B004G57GHK)

I am guessing on the sizing (diameter, width), based on the examples shown at 3:05 in this instructional YT vid:

Your thoughts?