In 4 simple steps you will realize the experiment:

• Opening Your Keyboard: Get to know your keyboard inside and out. Remove the screws on the back. Then, you can see all its insides. You can see the circuit boards, the keyboard inputs, and most importantly, the speaker it plays through and its two solder terminals.
• Attach Two Wires to Speaker: Drill a hole in the side of your keyboard, and solder up two wires with gator clips. You are going to solder the other ends of each of these wires to the two speaker terminals in your keyboard. This will make it so any electrical signal that goes to the speaker will also go to our oscilloscope. Thread the wires through the hole, so that we can close the keyboard back up and have them sticking out.
• Oscilloscopes Time: Hook up the two leads from one of the channels to the two gator clips coming out of your keyboard, and you’re almost set. The two main variables you’ll mess with are the Time/Div variable (x-axis calibration) and the Volts/Div (y-axis calibration). This equates to the x-axis being time, and the y-axis being volts produced.
• See That Funky Music: Your music visualizer is ready to rock! There is much to see no matter what you hooked up, but if you have a full-on keyboard, here are a few investigations that are absolutely worth it. Try the followings:

a)Frequency: Try playing a note at a time, and going up the scale. You can see as the notes get higher, the waves get closer and closer together, and visa versa for going down the scale. b)Amplitude: Turn the volume up and down on your keyboard, and see the effect on the waves. You can see volume’s correlation with amplitude of the waves c)Chords: Try playing one note, then another, and then both notes at the same time. The interference of the two energy signals aren’t always what you’d expect. You can see a definite difference in “discordant” combinations, and those that sound more soothing. d)Instrument Type: Beyond playing a main note, an instrument has many overtones, undertones, harmonicss, and more that give it a unique sound. If you have a keyboard, try flipping through sample instruments, and you can see how different the wave patterns are even when hitting the same key.