Did you try using VdmSound before running DOTT? Some of the old games don't work in newer windows environments, but VDMS emulates the sound characteristics of old-school DOS. Be sure after installing vdms, when you run the DOTT.exe file, right click and choose the vdms run option.
If this doesn't work, you can try using ScummVM with DOTT.
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"
-Ronald Reagan
Oh hey I just now donloaded the latest Version of ScummVM and it works great with both the floppy and cd version. On your audio setting (In scummVM) select PC Speakers. Works great. You can also use ScummVM on wii, Ds, Ps3, Psp, 360, and ps2. Pretty much all systems.
"The Simple truth is that we've
lost control of our own borders,
and no nation can do that and survive"
-Ronald Reagan
hur hurr 
Linear Mode
