You don't actually edit the BSP. That's the problem.
-Open the BSP in notepad
-then click on find
-type in music
-this will get you to the area you need to copy.
-copy that entire area and save it as the (name of the map).ENT
-open the entity file you created and edit the npc's
-then run the ENT file you created with the Entity Compiler
-which will create a new bsp of your map with the changes you've made.
If this confuses you then let me know what NPC you want in place and I'll do it for you.
Last edited by jeffcorn; 09-29-2012 at 12:15 AM.