In order to hook up your electric guitar to your computer for the Tuning
Wizard in "Teach Me Guitar Deluxe", you need an 1/4" inch to 1/8" inch cable. 
You can find this at a store like Radio Shack. You just need to select the 
'Line In' as your recording source in Windows.
 
If you have an acoustic guitar, you can place your computer's mic near the
strings for tuning purposes. Just make sure you select 'MIC' as your recording
source in Windows.
  
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Instructions for selecting a recording source:
  - Click on Start>Programs>Accessories>Entertainment>Volume Control
  - In the upper left click on Options/Properties.
  - Be sure you are set to Playback and check all boxes in the white 
       section at the bottom.
  - Do NOT click OK yet.
  - Switch to recording by clicking the Recording radio button.
  - Check the all the boxes in the white section below for this setting 
       as well.
  - Now click OK.
 
In this recording volume control, be sure the source you are trying to record
from is selected and the volume is up.

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As with all audio equipment, caution should be exercised during connections.

NOTE: The 'Deluxe' version has been discontinued.
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