The biggest problem with the Performance settings is that much of them (MFX settings, any Tone edits) are sysex and very difficult to track down and edit the correct hex value.
This is why, if you’re using the Keyboard Parts as part of the sequence, make sure that you save the Performance and recall it before you play the DAW into the BK.
There’s also a good case to be made for transferring the SMF of the DAW back to the BK to play if you want to do some surgery on the drum kit and effects. Those are easily edited in the Makeup Tools, and afaik there is no software editor for the BK9 other than the iPad BK9 editor (still available on the Apple Store), so editing this in your DAW is out of the question.
Compared to a synth workstation, an arranger is much harder to work with in a full studio setup, it’s simply not designed for the task, it’s designed as a live performance tool. This means we need to find workarounds to overcome some of the problems, and simply live with some of the others.
After all, the synth workstation generally sucks as a live performance tool unless set up very laboriously (and still can’t do live style play) so it’s unsurprising that the arranger has similar restrictions when used as a studio centerpiece…
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An arranger is just a tool. What matters is what you build with it..!