This is very much like how the Peachy already works. The major differences are that we are using the computer sound card instead of the Arduino's DAC, and we don't need current amplifying transistors since the sound card already has a strong enough amplifier. We also aren't strapping mirrors on to speakers (though that's kind of how we started out) but are instead building our own galvanometers that work on the same principles as a meter movement in an analog meter.