Perhaps you should get in touch with the developer and tell him you're using an EWI.
Is that brass library primarily designed to be used with a MIDI keyboard rather than EWI?
I will check it out later when I'm not on the smartphone. Maybe something can be done in the Kontakt script? It's not a Reaper problem anyway.
https://www.native-instruments.com/f...phonic.362099/
A lot of the expression is performed by the musicians themselves with EWI. In contrast to that keyboard brass libraries tend to be designed around fixed articulations. Often they haven't even considered a breath controller. IOW the timing and intonation is fixed/baked, and they rely on far larger collections of samples.