Works fine for me with a recent DOSBox CVS build as well as in 0.63. Tried with SoundBlaster Pro sound and both General MIDI and SoundBlaster Pro (OPL3) music. Music plays all the way through the intro and never cut out even after playing several minutes into the game.
General MIDI sounds much better than OPL3 for me, but I have a better MIDI synth than the one built into Windows.
I'm running with the dynamic core and cycles just under 20000 (although it looks and sounds fine at as low as 5000).
Suggestions:
- Try the DOSBox settings I mentioned, including a CVS build (if you haven't already)
- Make sure you're running the Windows latest sound drivers for your sound hardware (from Creative Labs' site) and that you have the latest version of DirectX installed
- Try running other DOS games. See if you can get them to autodetect settings, and if they work you can compare them to the ones you're trying to use with Blackthorne.
- If you're using a cracked version, try getting your hands on an uncracked version to verify that the crack isn't causing the problem.