Can we take a closer look at it i.e. can you show us the TXT? We can't fix anything if we don't know what the actual problem is.
However, I have an assumption with the problem: There is an old King of the Mountain port with custom samples. Now, the problem is that you just can't add "#amm" or "#am4" on top of the file because AMK loads the samples differently than AMM and AM4. If that's the problem then please show us the TXT (we still need to understand for what Addmusic the music was made for) and we then can fix the TXT.
Speaking of King of the Mountain: We host an updated version
of the song. It does sound slightly different but if it's good enough then go with it.
Okay, my layout looks ugly.