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gtuna is a chromatic guitar tuner for your Linux box using ncurses (it was born
as a guitar tuner, but it should be good as a tuner for any instrument connected
on your computer's mic).
Q: Where can I get it?
A: As usual, there are two ways. You can get the latest stable release from
http://0x00.ath.cx/prog/gtuna.tar.bz2 . Or (as I suggest) the up-to-date release
from GitHub: `git clone git://github.com/BlackLight/gTuna.git`
Q: How can I install it?
A:Just type `make` and press enter. Nothing more.
*N.B.* The requirement for getting gtuna working is having libfftw3-dev and
libncurses-dev installed on your machine.
Q: How does it work?
A: Just plug your instrument into the mic entrance of your computer, and pick a
string. In green you can see the recognized note, in branches () the computed
frequency of the sound, in square branches  the minimum frequency for the
recognized note, the effective ideal frequency and the maximum frequency, and a
-- means the computed frequency is very low for the computed note (so you need
to pull that string up)
- means the computed frequency is slightly low for the computed note
O means the computed frequency is ok for the computed note
+ means the computed frequency is slightly high for the computed note
++ means the computed frequency is very high for the computed note (so you need
to pull that string down)
by BlackLight, <email@example.com>
Released under GNU GPL licence v.3