Thanks for the quick reply! I did import the files separately in the Sound And Music folders but they still won't play simultaneously. Could it be because they're the same file format? I dunno; just spitballing here. I had to set up a script to prevent the sounds romf playing at the same time, but it refers to their tags; not any file.
I'll take a second look at my scripting; maybe I've missed something. I'll upload pics when I get home.