XTHX2
it is just like in the PSX version - on some levels music was repeating....don`t ask me, why

The problem for me was to correctly remember, which song played on the some levels. Yeah, I do have PSX Total Meltdown - but for some unknown reasons, game slows down...
As for those songs you mentioned....well, at first, I tried to modify music.def, inside the zip. To be more precise, I changed some song names, according to how songs were playing on PSX. But after some tests, I noticed that instead of PSX OGG`s, duke3d.grp`s midi were playing.

So, I decided to insert same song in the pack 2 times, if it was like PSX version.
I believe that it has something to do with the order of the songs in duke3d.grp...
But if somebody can make that music can be repeated on the necessary levels instead of copy\pasting it again - you can do that.
I wanted to achieve maximum effect from this music pack - as if you`re playing PSX HRP

It is you, who can say - was I able to do that or not.
OK, and here is another link to it. (somebody asked me to upload it to sendspace, right?)
Here:
http://www.sendspace.com/file/05bat0