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Besides physical structure, what is the difference between a curved and a straight windway in a recorder? I understand that a curved windway increases air resistance, but how does the sound quality compare in the two?

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Curved windways are usually considered to give a more interesting, complex tone quality, but I couldn't give an acoustic reason for this. They're definitely more difficult to produce I've also heard it suggested that a curved windway is superior because it allows condensation to drain to the edges of the windway more easily, where it will interfere less.

For the commenter asking what the windway is: enter image description here

Credit: Daniel Bingamon, Jubilee Instruments & Crafts.

When you look at the mouthpiece end of a recorder, the windway is the narrow slot that you blow into. Transverse flutes don't have a windway, or more precisely, the windway is formed by your mouth and lips directing the stream of air over the embouchure hole.

This picture shows a curved windway:

Photo of curved windway

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It's stood a long time - so here's an answer. Don't know about recorders, but on a flute I have which has two mouthpieces - a straight, normal one and a curved one, there appears to be no difference in the sound or tone between them. The curved makes the instrument easier to play, as the arm stretch is not so great, but apart from that, there is no quality of sound variance.

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Ehh? I don't follow. A curved and a straight windway have the same total instrument length. The arms have to reach the same length on both. – American Luke Nov 27 '13 at 17:43
I believe he's misinterpreting "curved windway" for curved headjoint, used for young flute students whose arms can't otherwise reach the keys. – NReilingh Nov 27 '13 at 18:52
Yeah, I was asking about the windway (not the headjoint itself). – American Luke Nov 27 '13 at 19:04
Help ! I've tried to ascertain what constitutes a curved windway, and failed. What is it ? This could be why no answers were forthcoming. – Tim Nov 28 '13 at 18:07
A curved windway is when the windway is curved. The middle of the windway is raised above the two ends. – American Luke Jan 9 '14 at 22:39

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