during my gig it's essential to tune my guitar down 1 half step...but i don't have the time to do that manually!!!
is there a tool which helps me to do this?
no. you can always use an evh d-tuna, use that to tune to drop d, and just reformat the songs ur playing to work in drop d.
bbuy a pedal tuner, TU-2 to be specific
Epiphone Goth Les Paul Studio
Ibanez SA120
Peavey Raptor EXP
Takamine Electric Acoustic
Boss CS-3
Boss DD-6
Boss TU-2
Boss MT-2 (For use with my Vox)
MXR M-108 10-Band Eq
Dunlop Crybaby Wah
Peavey JSX Head
Vox AD50VT
tune down and play with a capo?
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^ This is a good idea. just keep your guitar half down and stick a capo on your first fret for your standard tuned songs.

Or you could buy a new guitar.
Quote by Zoso68
tune down and play with a capo?

That will make bending a lot harder. Just try it and you'll se what I mean.

I suggest that you get a Pedal tuner. I have e Boss TU-2 chromatic tuner and it's really nice because you can cut the signal to your amp so noone can hear you tune. And it's easy to use.

Gibson Les Paul Classic '05
JEH Custom Superstrat '07
Rickenbacker 480 '73
Marshall 6100LM head '95
Engl E412SS 4*12" cab '02
Line6 DL-4 '07
Ibanez TS9 '08
Dunlop Crybaby from hell '07
Boss CE-2 '79
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what is a solo?
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Borrow a guitar from someone and tune it down then switch off as u need it

I agree, it's best to get or borrow another guitar just switch them when you need too.
Though I Am Only Here To Do One Thing, I Do Not Regret Being Born Into This World.
I don't think that they are out yet. I thought they were suppose to come out in the Summer but then they only debuted at NAMM in July. It will probably be a while.