dash toggle switch question

[erikh09]

Hey folks!

I am starting to tear the dash out of my 67 GMC and there is a toggle switch just above the ignition that I am a little curious about. I followed the wires and they appear to go to the radio and center dash speaker. Was this factory as I have seen at least 1 other truck on here with a hole in the exact place. Seems odd to me that the factory would install a toggle switch to seemingly turn a speaker on and off... The switch does not work so it is hard for me to tell exactly what it does.

Any info would be appreciated.

Thanks all