software

How do those work? does anyone have experience with them? Are they good? Seems good to me since I only tune down to d and just standard.....imput please

They replace the low E's allen screw that holds the string in place.

I had one on my RR-1, hated it. While it does drop the E to D fine, it requires the trem to be blocked. With a recessed trem, I sure as hell wanted to pull up, so I took that thing out and sold it.

I have one and really like it. With my technique i usually use my left hand to increase pitch (bending up). The trem is blocked. There is a allen screw to set the two notes, E and D. pretty simple devise. I have quite a few guitars, and i actually block all of them. I just don't use the trem to increase pitck, and I always hated breaking a string while playing on a floating trem at a gig, and having the guitar go all out of pitch. It works real well for me.

it works, as long as you use pretty skinny strings. I went up to a 56 on the bottom E, and ther isnt enough adjustment on the thing. The heaviest set i could use it with was ernie ball 9s. So, no, its pretty useless for me.