Do you have the victoria line add-on with the 1967 stock? If you do, that will show you how to link them to the "B" key. PM me if you don't and I'll send you an example and how to set the files up. Mostly if they are cab files, they should be 16 bit, 11htz stereo or mono if they are eng sounds. You'll need to let me know what your file names are and stock you wish to use aswell!