Bit of an odd error. I have a system based around a Chaintech 6VIA5T motherboard. I have a vortex2 SuperQuad soundcard with a MIDI daughterboard. Windows 98SE. The vortex2 is emulating an sb pro and has its midi port at 330.

I can select DOS midi as "wavetable" for the daughterboard or "mpu401" for an external device, but I think either way it resides at 330.

When I run this old DOS warcraft game, I can set the sound and music cards. I set it to use GM and set the MIDI address to 330.

If I set the DOS midi device to the mpu401, the game seems to play OK but of course I don't get music.

If I set the DOS midi device to wavetable, the game calls up OK but when the first is loading it crashes. Sometimes it's a BSOD that clears, but on exiting the game Windows has crashed [it locks]. Sometimes the game itself actually crashes to what looks like 20x20 text mode with a lot of error messages, the first part of which reads:

DOS/4GW transfer stack overflow

The only other old game I've tried is Heretic but that runs OK - ie. I get music played via the daughterboard.

Any ideas?