I'm trying to input analog audio from an audio cassette player into the mic input of my Latitude D510 (it has no line input), but the signal from the line output of the cassette player is too strong. I'm using the program Audacity to process the input audio. It has the ability to vary the strength of the input signal, but not enough ability to reduce the strength of the incoming signal so it's usable.

 

I need to attenuate the signal from the audio cassette player _before_ I input it into the Latitude. Any suggestions?