A short clip from Rage - note: Black and white image, it would normally be red.
Another short Rage clip
Speed control calibration tone for standard musical instrument A 440Hz tuning.
55Hz tone (a lower octave of A 440Hz) , play this video, feed the audio to the Musicalaser then adjust the speed until a similar image appears.
Note: green laser image
Demonstration videos with sound - click one and wait for the file to download :
Note: The flickering is due to the webcam frame rate and is not present in actual use.