The guys in my group and I got on this subject when we first got some of the Seiko STX1 clip-on tuners, see this thread on the equipment board- LINK This tuner has a series of red lights at 439, 440, 441, 442, etc. The odd thing is that the green light comes on at 441, the lights next to the other numbers are red, indicating that 441 is "standard", at least to the people at Seiko. We disregard the green light and tune to 440 like we're used to. I am not an expert on this subject by any means, and I read a post from another forum HERE that says wind instruments are made for A-442 and for A-445. Could this be the reason why the green light is on 441 and not 440, some kind of compromise? If anyone is willing to shed some light on this topic in general, I'd love to learn more.
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