I haven't had a chance to poke around in the SPIKE system software. Does it have an option to activate a real knocker signal like SAM system games have?

These links might help.

If you figure it out maybe you could help me when my Iron man VE arrives.

I would like to try this in the new spike system as well does any buddy know if it is even possible.

No loose 50v in the cabinet in SAM games. You would have to borrow from somewhere.

Andrew

Pop Bumpers in SAM/Whitestar are technically 50VDC (actually closer to 70VDC ) and Spike PB are 48VDC.

These are what a few of us MODDER's have used to "borrow" Power from somewhere else - 3-M Quick Taps.

Quick Taps are pretty straight forward & easy to use - only minor downside is they are kind of like IDC Connectors in the context that by design they slice through the insulation but some times they can also slightly slice through a few of the Wires Strands:
http://solutions.3m.com/wps/portal/3M/en_US/EMDCI/Home/Products/ProductCatalog/~/3M-Scotchlok-Electrical-T-Tap-Connectors?N=5430181+3294245702&rt=rud

On an 18AWG Wire like the Pop Bumpers use it shouldn't a problem, however on 22AWG or smaller diameter Wires it may be an issue over time. (IMHO).
Pick the largest size Quick Tap that covers the Wire Gauge you are splicing into - i.e. use a Red Quick Tap (18AWG - 14AWG) for the Pop Bumper Wires (18AWG), while a Blue QT (22AWG-18AWG) would work DON'T-DO-IT.

Terry (PBL) uses these in his LOTR Backbox Flasher Kit - had 1 his Kits in our LOTR for over 4 years with no issues.

Kim

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On SAM & Whitestar Systems you could also grab it off of Pin 1 of Connector J-6 or J-7 .

Same place you can grab Power (& Grounding) for under Cabinet Flashers.