VDMSound is centered around the floppy version. If you downloaded DOTT form the internet or a Dos download site it is most likely the floppy version. If it is the CD it will still work with VDMsound but it is best to download DOSBOX or ScummVM. Dos box is only a emulator and wont give you sound without the sound upgrade from lucasarts.com
"The Simple truth is that we've
lost control of our own borders,
and no nation can do that and survive"