Howdy!
I can't seem to get the music to play during the game. The sound effects and intro video sound play fine but alas no game music. I have ticked the Music option on the in-game toolbar.
I figured out where the game seems to store the sound settings; in the aptly named "SNDSETUP.INF" in the theme park directory. The settings menu defaults to installing and saving settings to C:\THEME.CD whereas the game is installed in the root C: directory (as far as DosBox is concerned, I think). However it doesn't like installing or saving settings to C:\.
Maybe I'm just getting massively confused. Any tips would be handy!

EDIT: Changing the SNDSETUP.INF changes the emulation of the music in the intro. I think that means that the music may be working just not in the actual game. There is actually supposed to be in-game music isn't there? It's been so long since I played it I honestly can't remember.

After eventually checking some YouTube videos it seems that there isn't any in-game music. Silly me!

EDIT: Erm, how do I mark this question solved or delete it?

I'm actually not sure, but you don't necessarily have to worry about it.

Side-suggestion: you could get some music to play while you play the game (like the Theme Hospital OST or something ;)

There IS some music in the Intro and there are sound effects during gameplay.

The problem is that changing settings (by using the Icon in the GOG-Menu) does not only edit the file SNDSETUP.INF, but changes also the file THEME.BAT. Afterwards the game might not start anymore.

Here's what THEME.BAT should look like:
____________________________________
@C:
:START
@intro -C:/
@main -cC:/ -dC:// -l0
@IF ERRORLEVEL 10 GOTO START
@cd \
____________________________________

Deleting the intro-Line skips ist, obviously.
By changing the value -l0 you change the language of the game (-l1 for German, other values not tested by myself)

Where do i find the theme.bat?

THEME.BAT is located in the directory "C:\GOG Games\Theme Park" in case of standard installation.
After installing there is a direct link to in-game settings in the windows menu.
BTW, I've found a manual in the meantime: http://www.lemonamiga.com/games/docs.php?id=1634. Helpful for the controls.

Thanks for your reply. I forget to say im using a MacBook and i dont know where to find THEME.BAT on Mac.

Somewhere in there.

I found it. Thanks bro.