Etant donné que je n'ai pas d'accordeur et que je m'accorde à l'oreille, je pense que c'est un battement dû au fait que je suis accordé un demi-ton trop bas. La description de wikipedia ressemble à ce que j'entends:
Citation:
In acoustics, a beat is an interference between two sounds of slightly different frequencies, perceived as periodic variations in volume whose rate is the difference between the two frequencies.
With tuning instruments that can produce sustained tones, beats can readily be recognized. Tuning two tones to a unison will present a peculiar effect: when the two tones are close in pitch but not yet identical, the difference in frequency generates the beating.
The volume varies like in a tremolo as the sounds alternately interfere constructively and destructively. When the two tones gradually approach unison, the beating slows down and disappears, giving way to full-bodied unison resonance.
C'est pas plus mal que je sois accordé en 1/2 step low (enfin, presque), c'est le cas de pas mal de guitaristes. Toujours est-il que je devrais m'acheter un accordeur ^^. Merci pour vos réponses, Thorn Kaos et 8