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I am trying to program my Radias to receive midi commands from my breath controller.

I'm using the Yamaha KX5 and BC3 to send the midi information to the Radias but can't seem to get it to react to the breath controller information. It is only responding to the KX5 keyboard.

Any ideas what I am missing out? How to route the information right? The BC3 gain and overset are ok.

First, you need to determine which midi CC event is being sent on your KX5 in response to the wind controller. It could send a CC for expression, pitch, modwheel, etc.

Let's say it sends a midi CC expression event. Radias programs have no mapping for a CC expression event, as I recall. So you need to create virtual patches that make the expression event do something.

Go to the Global page of the editor to set MIDI 1 to CC#11. Then add a virtual patch with MIDI1 as a source and Amp Level with some intensity. Maybe add more virtual patchs with MIDI1 as a source and Filter 1 cutoff, Filter 1 resonance, and Drive/WS Depth, to make the sound brighter as the expression increases, like how a trumpet or sax sounds with greater breath pressure. You'll have to play with the program to dial in the virtual patches to sound natural.

GM 'Breath' control - CC02 - is mapped by default to MIDI2 (this also corresponds to Joystick -Y (downwards) axis on Korg's workstations). So you could try routing this to cutoff or drive/WS depth, or something else.
As xmlguy mentions, the question is whether your controller is transmitting that or something else. Some default to CC7 (volume) or CC11 (expression, which is typically used as a 2nd volume control).

i thought this might be the case..
i just have to find where the information goes.
thought i'd ask if there was something special about it, before messing things up.

thank you for the help.