Issue with Sound Actor not responding to collision

I migrated some assets from another project, including some sound files, which play fine. One such Actor responds to collision, but I can’t get the others to come alive. I’ve tried dragging them into the Persistent Level, enabling Override Attenuation, editing the position and size, Falloff Distance, etc. but nothing during Play. I’ve got Show Sounds checked, but even when I collide with the two tracks that function, I see nothing logged to show that, much appreciate a tip what might be out.

Big thanks.