Looong time lurker here.

I managed to get The Horde (Floppy version) to run with sound, including music, in PCEM.
I have several profiles set up in config.sys + autoexec.bat for DOS 6.22
I discovered that it works when I select the Gravis Ultrasound profile.
In the Adlib profile (just loading sound.exe in autoexec) the game runs without sound.
In any SoundBlaster profile the game locks when it should make the first sound (clicking on the compass)

The CD version runs without music but with sounds, also in the Gravis profile.

I think I've first tried to make The Horde work with sound + music 15 years ago.
Only recently I dabbled into Gravis, thanks to Vogons' drivers and guides.