Boehm was inspired to begin developing his new flute design after he heard Charles Nicholson play, and was impressed with his strength of tone and projection.
The goal of the design of the Boehm flute was to give each chromatic note of the scale its own tone hole, spaced and sized on the bore according to what is acoustically correct rather than merely what the fingers could reach or cover.
This would have the effect of improving the intonation of the flute with itself across different key signatures. The voicing, or the sound quality of each note would be as nearly as possible the same as that of the other notes of the scale; this is actually one of the Big Differences between the two kinds of flutes and deserves a closer look…
In trad tunes, you see the same “building blocks” used again and again in different tunes. One of my favorites is the “rocking pedal,” where a series of notes is alternates around a drone note. And there is one of these that is instantly recognizable on just about any wooden flute: the figure g2dg egdg is instantly recognizable on almost any Irish flute because of the very different sounds of the d and e notes.
On the Boehm system flute, you can certainly play that figure with agility, but the difference in the d and e are lost, and with it much of the “flavor” of that nice little rocking pedal is lost as well, at least to my admittedly prejudiced ears.
Boehm didn’t quite achieve his goals…any flute is a series of compromises, and his is no exception, but there are only a few notes in the over three octave range of the Boehm flute that need special treatment, so he did get awfully close to his goal.
Middle C-sharp tends to be very sharp on the Boehm flute, and also has a slightly different timbre, because its hole also has to double as the octave vent for D. Third-octave E-natural is a problem, as is third-octave F-sharp, both because of peculiarities in the mechanism not allowing quite everything to be vented that needs to be.
The Boehm flute is a very projective instrument–at least, given both a quality flute and an experienced player, so much so that Wagner (the “Ride of the Valkyries” guy) didn’t care for the Boehm flute, and called it a “sound cannon.” It tends to cut through the woodwinds of the orchestra and be heard, which contrasts with the wooden flute, which tended to blend nicely with the other woodwinds of the orchestra.
Now the range of the two kinds of flutes are roughly equivalent. Charanga players routinely take the wooden simple-system flute into the fourth octave, for instance. And pretty much any music that can be played on the one kind of flute can also be played on the other…well, except for some modern “special effect” pieces that depend upon peculiarities of the Boehm flute for special sounds, like key slaps.
I enjoy playing both kinds of flutes. They are different instruments to me, and I take a different approach with each.
–James