Lee, I'd get back in touch with Ketron... This doesn't make sense to me. It seems like you've got the Audya sys-ex implementation of what it SENDS, but the button protocol of a separate sys-ex for press and release, that doesn't really seem to be necessary just to trigger a function in the OS. Especially for something like BREAK, which is a one-time call (break only needs to be called, not stopped, too).
Personally, I'd want to take a look at the regular MIDI implementation chart, not just the sys-ex codes. I may be wrong (I hope I'm not), but most arrangers allow remote control of their style engine using simple PC#'s and CC's, which are a doddle to program, rather than sys-ex for EVERYTHING. For instance, my G70 uses PC#'s for all style related controls, Var's, Fills, Breaks, Intros, Endings, etc.. Hence, it's a snap to control externally.
I sincerely hope you have overlooked this, rather than having to use this incredibly convoluted system of sys-ex to emulate button pushes and releases of the front panel...
However, the one GOOD thing that might come of this is, if your remote has a good 'learn' feature, you MIGHT be able to hook it to the Audya module, put it into 'learn' mode, and simply press the buttons on the Audya to program the remote. But one of the issues you are going to come across is that sys-ex gets sent all in one package. So if you are playing AND doing some button pushing, you may notice a slight loss of 'feel' as played notes get held up while the sys-ex string is sent.
Try and see if you can't do this with a simple PC# or CC code first, Lee...
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An arranger is just a tool. What matters is what you build with it..!