rh-tech.org

I stumbled upon this and it works well! I already had the RadioShack 40-993 Mono Stepped Volume Control. I added a 44uf capacitor across the resistor to retain the highs ...

Here's a link to the page where I found the Quick and Dirty Attenuator:
http://www.charlestongolf.com/lineout/pages/QD_Attenuator.htm