For the past two years my haunt's soundtrack has been a randomized "LIVE" sequence patched together on my modular synthesizer rig:
My friend at the local paper dropped by unannounced on Devil's night, and posted some video onto her paper's web-page.
I didn't have the fog or spider swarm projection going, but at least I have some record of the sound effects.
Here is a link to the video:
ALSO - Not as audible, but my 1st attempt at patching creature sounds from the year before: