Can you use a wind controller, like the Akai EWI, the Yamaha WX, or the Roland Aerophone, as a convenient and/or quiet way to practice a “real” woodwind instrument, like the saxophone or the flute?
No, not really.
You can practice some very limited aspects of woodwind playing. For example, each of those wind controllers has fingering patterns that resemble (but are not identical to) the fingerings of standard woodwinds. If you are in the very early stages of playing a woodwind instrument and still trying to memorize fingerings, I suppose you could use a wind controller to help you with that specific task, to the extent that the fingerings do match.
The Akai instruments have saxophone, flute, and oboe modes, plus the more flexible “EWI” mode that is quite saxophone-like, and even a couple of variations of a valved-brass-inspired mode. The Yamaha WX5 has several saxophone modes and a flute mode. The Roland instruments are set up to map fairly directly to saxophone fingerings, even going so far as to include some of the saxophone’s more problematic features like “palm” keys. However, with that exception, none even have all the keys needed to learn proper saxophone, flute, or oboe technique.
(None of the instruments currently has a clarinet mode, presumably because the real-clarinet phenomenon of overblowing to odd-numbered partials raises some complications for an electronic instrument capable of many octaves of range. And none of the instruments has the physical keys to reasonably approximate bassoon technique.)
Plus, in all cases, including the Rolands, none of them can fully imitate the “feel” of a standard woodwind. Beyond the very basic stage of learning fingering patterns, much of the fingering work that woodwind players practice has to do with nuances of the fingers’ interactions with the keys. Even switching from one flute to a slightly different model of flute can mean having to re-adapt to the keys’ precise locations, spring tensions, etc. Switching between a flute and a wind controller is a much larger leap.
And, of course, no major wind controller currently provides a realistic approach to tone production. None has a reed that functions as such, and none has a flute-like embouchure hole. There are some superficial similarities like breath pressure being mapped to volume, or a bite-able mouthpiece that allows for something like saxophone-style jaw vibrato (or to the ill-advised reed instrument technique of bending pitch with jaw movement).
So, can you practice on it? Not really.
But the good news is that wind controllers (particularly, in my opinion, the Akai EWIs) have lots of potential as instruments in their own right. (If you aren’t familiar, look no farther than Michael Brecker’s playing for an eye-opener.)
Rather than looking at wind controllers as a “practice” instrument or a low-budget stand-in, consider a wind controller to be an additional avenue for expression. Playing it well requires just as much hard work, but also brings worthwhile creative rewards.