Hi Jingleman,
I understand the problem. Arrangers are Realtime only. I.o.w it has no idea what progression of chords follow next. BiaB does. So even before anything plays, it is fully optimized for those specific sequence of chord changes. No ways can it be achieved in realtime.
I thought long & hard about this. One solution for an arranger like i.e. the Ketron Event would be to have a "Learn" button. So when you play live, anytime you enter any repetitive section, you select this button on the fly at the start & precisely at the end of the repetition.
Now the arranger can do EXACTLY the same as BiaB for the next repetition. The result should be spectacular. It would be like a "Variation 1" for the first session and more complex variations for the rest to follow.
But yes, BiaB could tone down their solo sections for Realtime playing and allow you to interface with something that can influence whatever is currently playing. That would really create something AWESOME!!! I will not be surprised if they are already working on such an idea.
In any case, with the newest arranger technology, one can at least create something in an audio format with BiaB that could interface with the arranger (i.e. a multipad) and use this to GREATLY enhance your performance. Pity I do not have an arranger for now as I could demonstrate this with awesomeness. This would be the natural way to go for me.
As far as I understand, the Ketron Event would make this easier than anything else.
Also, think what would happen if Ketron could come to some sort of a financial arrangement with BiaB to use some of their styles and voices. They have such a vast database (I mentioned 11500 before). Yes, many of these utilize the same style, but you can browse in completely different audio sections into ANY track of ANY style which IMMEDIATELY makes for a complete new style.
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Make sure you'll fly forever!