An update...
Andrew, the created ini file with both sets of code you gave did not work. See attached. There are two instruments. One BIAB rendered ok, which is arping synth (clean sound) all the other stuff, although it sounds "cool" but that was not the "instrument" it supposed to render, LOL.

It is actually sampled acoustic hand drums (very acoustic sounding) from Halion Ethnic section, but they got rendered some strange EDMesque way. My guess, it happens because some instruments in Halion have deep midi programming with sequenced/arping notes.

I will avoid using Halion in some ways for now in BIAB and focus more on creative, non troubleshooting things smile

One day, if the problem persists with new projects, I will transfer Sonic license to a backup computer and will test it with the same troubled projects, just to see if it is "specific system" issue.

Thanks everyone who participated!

Attached Files (Click to download or enlarge) (Only available when you are logged in)
render.mp3 (524.08 KB, 2 downloads)