Thanks for your help. I was succesful yesterday (it almost drove me crazy)
I didnt knew that you can record the OPL-Data within DOSbox... i usually dont use Dosbox.
Well... first i recorded the OPL-data in Dosbox. (I had to download Lemmings 2, because my CD-version has no Soundblaster Sound)
After recording, i had to convert the .dro File into a .imf File (There are tools out there, but you'll have to figure out WHAT do you want to convert)
Now it gets a little complicated and "work-intensive":
I have a small tool called "ImfCreator". There is a small function inside where i can import instruments from .imf Files.
The hard part is, that the program is very unstable, doesnt run on older systems and you can only import ONE instrument from an .imf File.
You are also unable to create a new/blank instrument-bank and just put it in there. You always have to overwrite the standard GM-instruments.
Anyway. After importing an instrument, the program shows the settings (like on synthesizers).. now i can write them down or make a screenshot of it.
Going back to my music-computer (where imfcreator wont work) i'll type all the settings into my nice little music programm.
Repeating those steps for every single sound within a tune... depending on the instrumentation, each tune has 10-20 sounds in it.
Well.. its working but its a freaking time-taking procedure! But i'll get this done on a saturday afternoon