The NeoPixel strip comes with three wires attached to the IN end for easy connection. These will be used for the first horn.

Cut the strip to the length you want for your first horn. It's not a bad idea to make it a little longer than you think - lengthening this strip is tricky, but shortening it later is easy.

It's helpful to cut on the very front edge of the copper pads, leaving a full pad on the cut-off side to make it easier to solder. These pads are tiny, and soldering to a half-size pad can be extra tricky.

Solder a red, black, and green wire to the IN end of the cut strip to make a second strip. Be sure to get the wires in the correct configuration - you can use the first strip as a reference, just make it match.

Trim the second strip to match the length of the first. Count the number of LEDs in your strip and write this number down somewhere. We'll use it later in the code to refine the animations.

Strip a little shielding from the other end of the wires. Twist the two color coded pairs together. Insert both black wires into G, both green into NEO and both red into +5v on the PropMaker. Tug on the wires to make sure the connection is secure.

Plug in your battery or USB cable to power up the PropMaker. If all goes well, your lights will come on. Shake the controller to test the animation modes.

If everything's working, add some heat shrink to the wire connections on the LED strips to hold the solder joints firmly in place.