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 final string: -- 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, <blacklight@autistici.org> (C) 2010 Released under GNU GPL licence v.3