27v is a mod worth doing on basses, possibly on extended range emg setups(8 string?) as well.
18v mod is also incredibly easy to do if you do it like this:
Fool-proof and easilly reversible if you dont like it, cheap as hell, get the parts at any electronics store thats worth shit.
If you have a separate cavity for battery(unlike me), make sure you get sufficient wire lenght to shove either one or both batteries inside the cavity if you've got the space
Getting the full 8 working is pretty hard though
And lastly, this pretty much blew my mind. I don't know if anyone else here will find it interesting, but maybe it will shut alot of people up about how much better one instrument sounds than another, considering this piece of shit sounds better than half of the things that people seem to be so in love with now days, ie. the Alexi<3 Geetars
http://www.youtube.com/watch?v=SohWrnzYqAk&feature=related
the "8 finger" stuff is ok, like stanley jordan is badass and all but alot of the times it gets redundant and is usually just chromaticism
The EMG 81X, if I remember correct is supposed to be like a 18V modded EMG 81, but runs on 9v.
Wonder how that would sound on 18v?