Almost everyone suggested a simple voltage divider made of 2 resistors and
some tape; an inline pot will also work. You can use a divider made from 2
pots, get the audio like you want, then measure the pot resistances and
subsitute fixed resistors into the line.
One "neat" solution is at
http://www.radioshack.com/product.asp?catalog%5Fname=CTLG&category%5Fname=CTLG%5F007%5F002%5F003%5F010&product%5Fid=42%2D2559
(Be sure to get the whole URL or go to www.radioshack.com and search for
part #42-2559.)
I've got enough suggestions now - thanks!
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