You'll need the following:
   * STK200+ board from Kanda or Logical Devices
   * One length of audio cable, with 1/8" mono miniplugs at each end.
   * Two sets of test clips. You'll actually only use three of the lines.
   * Wire cutters.
   * Wire stripper or pocketknife.

1. Cut off one of the ends of the audio cable. I would cut close to one
   fitting, so you have as much cable as possible. 

2. Strip the insulation from the cut end of the cable, exposing about
   one inch of the two wires inside.

3. One wire should have more insulation around it. That wire carries signal
   from the CD changer. The other wire should be bare. That wire is the 
   ground. Strip about a half-inch of insulation off the center wire.

4. Attach one of the test lines to the center wire using the clip on one 
   end. 

5. Attach another of the test lines to the center wire. If you do not have
   enough center wire exposed for both clips, you can clip one test clip
   into the other clip, and then clip that one on.

6. Attach the last test line to the ground (outer) wire.

7. Position the STK200 so the row of buttons is at the bottom. There should
   be a ground wire shaped like a triangle in the right corner; that's a grounding
   point. Clip the free end of the test line you used for ground onto this wire.

8. Above the ground point is a set of six pins. Clip one of the signal lines
   to the center pin of left column of pins. That's the input line.

9. Above that set of six pins is a set of ten pins. Clip the other signal line
   to the middle pin on the right column of pins on that header. That's the
   output line.