
Here are a few differences I've detected between the Yamaha WX5 and the Akai EWI series while shopping. So it kind of comes down to knowing your sound sources. Remapping breath onto velocity sounds right, but most synths only vary the attack with velocity, where breath is a continuous controller message that can affect the note after it starts.


Any other VST will pretty much ignore the bite, BC and maybe velocity unless you route the MIDI to some parameter of your VST, which is where REAPER really shines. Aria is somewhat special in that the EWI-specific parameters like bite and breath controller are mapped to do something (allegedly) useful out of the box. You can control any VST you like from the EWI. So assuming the next question is "how do I actually do it in REAPER" my answer is "I don't know, I never needed to." I don't look at those things as performance parameters, I look at them as setup, so I set mine to flute(ish) fingering and key of C once and never did anything again with the standalone app-even after I changed my host computer, because the controller persists the settings. Jason documented the otherwise undocumented NRPN messages, so if you really have a compelling need, you can rig up a way to send those bytes from REAPER and change stuff mid-performance. The transpose setting can easily be worked around in REAPER or other host, so it's really just the fingering you have to sort out, and maybe the breath and bite gain if it's not to your liking out of the box. The chip inside the EWI remembers the setting until you change it, so you don't need to constantly run the provided software as standalone. It's MIDI NRPN data that is used to set the fingering, breath gain, bite gain, and the transposition. In theory, you can configure the EWI without the software, but in practice you can't.
