MFME 6 how to add sounds to electrocoin layouts

Hey, what's the easiest way to add coin sounds etc to all the electrocoin/concept layouts? I get insert coin sounds, but no coin eject sounds, just the dubba dubba dubba dubba dubba sounds from the machine. This applies also the older layouts like TTX's Big 7's, and the £4 cash layout of this machine, plus all bar x machines apart from the concept where I just get insert/eject sounds..