Thanks for sharing a way to hear this music as it was meant to sound! I enjoyed it in P99 for a while, but I had to stop using it after I ran into some technical issues between VirtualMIDISynth and other games.
In December, I read someone's post on the P99 reddit about adding new music into Kunark zones using a tool to convert the sound trigger files into the newer, less cryptic, EMT format. Since then, I've done a similar conversion for all Trilogy zones with Maestrobob's mp3 transfers instead.
TrilogyEMT v0.1
The install is detailed in the readme, but it's basically drag-and-drop into your EQ folder. The EMT conversions aren't perfect and there's more I hope to add to them. Please share any feedback if you try it out.