Okay so i tried the HEX-Trick after i got the above lines:
- "hexedit doom.x86"
- go to the byte to modify by typing "Ctrl-G" and entering the address: 001BED1B
- modifiy the "74" under the cursor to "EB".
- save (Ctrl-S) and quit (Ctrl-Q)
Thats all, now I have sound, great trick :wink: