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Bk-7m with Akai EWI 5000
The Ketron module has a parameter which permits modifying chords by means of an old-school "four switches" expression pedal. (The idea is that by tapping one of the switches with the side of your right foot or heel, you could designate a single note chord as minor, 7th, diminished, etc.) So an SD40, multi-switch as I've described and a set of bass pedals would get you there. Obviously you would have to play seated.
You could use MIDI files or .WAV and MP3 backing tracks and simply use the BK as your sound source for the EWI, but Ted is right. If you want to tell the arranger section what chords to play in realtime simply by playing the EWI, there are too many chords for one note. It will do major chords given one (root) note, but minors and others, no, they need two or more notes.
The Ketron solution will work, but it seems unintuitive, forces you to play seated (most horn players like to roam around, LOL) and an SD40 is about $2500 (more than 2.5X the cost of the BK-7m)!
I know a few horn players that use modules and keyboards for backing, and pretty much all of them use either SMF's or audio backing tracks. Arranger technology pretty much depends on one hand being able to play the chords, the other hand plays melody, solos etc.. A monophonic horn simply can't do that. Even if you set up the Ketron system, you have to stop playing the melody or solo to play the note (and pedals) for each chord in the song. It might work sort of OK if you are doing dreamy Enya-esque slow new age noodling, but standards and pop songs have chord changes too often to be able to interrupt the melody or solo to tell the arranger each chord.
Tell us more about what you are trying to do, klaremete...
You might want to think that through a bit...
Say you play a C...
Do you want a Cmaj? A Cmin? A Cdim? A C7? An Ab/C? A Bb/C?
You see the problem here? One note cannot define a chord.
Use the orange Action drop down menu and select what you want.