I just bought an Akai EWI4000S, which I'm enjoying a lot with my Ketron SD-2's sax and other patches. But it sure would be nice to be able to control dynamics -- e.g., if the Ketron understood a MIDI breath controller message. I also own a Roland SD-50, but that doesn't appear to be work, either. I'm under the impression that a Yamaha Motiff XS might do that trick, but $1300 is a bit more than I'd like to spend right now. Are there any other synth possibilities? Or perhaps, any boxes that convert breath data to velocity, and would work with the AKAI?