This DIY knocker kit
http://www.home.earthlink.net/~pinball_stuff/knocker.htm
hooks into Q24 which is a ticket dispenser.
The note at the bottom says "The knocker will only knock when a credit is awarded. If the machine is set up to award an extra ball instead of a replay and/or special, there will be no knock."
I like to set my games up at home for Extra Ball.
What I want to do is replace the knocker sound using Pinball Browser with a completely blank sound. Then have Oliver create an option to fire Q24 whenever the knocker sound is played. I think this will make the DIY Stern knocker kit act like a WMS/Bally knocker and knock when extra balls are awarded along with matches etc.
Chris