Exactly what I wanted!
It's about the same principle as SkalMac Tuner BUT for people who tune their guitar differently than standard tuning (for myself, I tune it one tone lower, but it's also perfect for "open-tuners" !), and it can suits the need of any other instrument though you see a guitar picture... ;-)
Of course, as I read in some other review, you need an ear and it's a simple sine wave, but I suppose that it's time to educate your ear if you want to become a musician, uh? ;-D
I was forgetting that there are also keyboard shortcuts! (numeric keypad)
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