Originally posted by: erac
What's the red button? Emergency shutdown?
To deploy the nukes, of course!
I get asked that a lot actually. It's not a button but a volume knob to control the expansion audio.
Instead of a 47kohm inline resistor like Bunnyboy said to use, I have a grounded 10kohm audio taper pot installed so I can vary the expansion sound channel from zero to loud. It sounds "balanced" in about the 2/3 to 3/4 position.