You’re doing this on the fly, while the style keeps playing, right? If you’re stopped, the new Performance should completely override everything, unless you have some Performance Holds enabled. Check into those.
Check your OTS Holds as well, if you’re using those…
Make sure you aren’t confusing styles and Performances. Selecting a different style won’t override the current Performance settings unless you have the OTS enabled.
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An arranger is just a tool. What matters is what you build with it..!