Hi pinsiders. I am having an intermittent problem with my Metallica pro table (HUO out of box about 3 days). Occasionally the game will let out an ear piercing squawk. The squawk is much louder than either the callouts or the music, and loud/shrill enough to send the dogs running and for me to be wary of it while playing.

It seems that it only occurs after starting sparky multiball but not right when sparky is getting fried. I have not been able to start any of the other multiball modes yet so I don't know if it occurs for them.

Anyone have any thoughts on what this may be or if anyone may have heard of something similar on other tables. Searching here and google did not provide me with any answers. Of course I may be searching for the wrong term.

Thanks for the responses. I will change that setting and see if it helps.

Rookie card indeed. Just happy that there is a community of folks out there that can help.

Confirmed that this was indeed what was going on, turned off the knocker and verified the sound both by posting a high score (yay) and by testing it in the diag menu.

Out of interest @accidental did older games used to have some kind of physical knocker that made some reasonable sound to indicate when a free game was awarded (more rookie questions!)?

Found this DIY knocker mod for Stern machines - may have to look into it.

http://www.home.earthlink.net/~pinball_stuff/knocker.htm

Thanks again pinsiders.