So, about the clipping, I had to amplify most new tracks considerably in Audacity to get them to be appropriately loud enough. Most were just entirely too quiet compared to the base music.
Back then, I did not know about using compression to normalize volume, so a small number of the Music mod tracks may indeed have some clipping (audible clicks). I did not believe it to be noticeable in-game, though it may be more obvious when listening to the isolated tracks w/ headphones.
It might be worthwhile for me to go through and use some compression to amplify the offending tracks without clipping. I'll check the Jungle tracks. If there any others you notice, please let me know and I will address them as well.
The Music mod tracks are in addition to the default music. Very little of the default music is gone - all I can recall removing is some of the more boring Orc region drums. In most cases, I merged the default music tracks for a given region (typically short 60s tracks) into a single audio file. That left room for new music to take the file names of the old tracks.
So the Music Mod is more of an expansion than a replacement.
No one's ever asked me before, but it shouldn't be too hard to make a track listing. I may do that today. There is indeed a hefty dose of Kirill. His music in the Divinity games was the first I ever listened to a game soundtrack for pure pleasure.