Sorry, Arranger (got a shorter name we can use? ) but you apparently have no idea how powerful the K2500 is. You can modulate ANYTHING with anything, and then use that to modulate something else! Including breath control.

It is the most flexible hardware synth I have ever used, and still to this day astonishes me by being able to do the most whacked out things I could ever ask it to...
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An arranger is just a tool. What matters is what you build with it..!