there should be interfaces to hand your midi data over to the sound card. maybe even via the Windows
API.
You might want to search the MS Developer Network library:
MIDI playback
EDIT: the very first result seems to provide what you want:
http://msdn.microsoft.com/library/de...idioutopen.asp
You can pick the interesting "midi..." functions from the TOC on the left of the page
Lukas Erlacher
Suche Grafiktablett. Spenden/Gebrauchtangebote willkommen.
Gotteskrieger gesucht!
For it is the chief characteristic of the religion of science that it works. - Isaac Asimov, Foundation I, Buch 1