Step 1: Gather the Materials
1) littleBits x Korg Synth Kit
2) littleBits Light Trigger module
3) Flashlight with strobe mode (some smart phones may also have a strobe mode or app)
4) Speaker with auxiliary input for other drum machines
5) Drum machine with LED tempo indicator - Bleep Labs BleepDrum used here
6) Plastic tube/cylinder - plastic syringe used here
7) Electrical tape or other opaque tape
8) Utility knife or box cutter
This allows for many possibilities, so look around your house for various light pulsing things!
Step 2: Making a "light Funnel"
Cut the plastic tube so it is about 2 inches long. Be careful with the utility knife and cut against a solid object (not your leg!).
Wrap electrical tape around the length of the tube. This will block light coming in from the side so that only your desired light source triggers the sequencer. This is similar to the principle of a vactrol, which is often used in modular synthesizers to trigger sounds.
Step 3: Assemble the Synth Kit
The rest of the Synth Kit can be set up to get the sound you are looking for. Add some filtering, delay, or noise, to taste.
Step 4: Turn Out the Lights, Trigger the Synth, and Dance!
Video 2: Use a drum machine or synthesizer/keyboard that has a tempo light indicator to synchronize the littleBits synth with your drums. The LED on top of the BleepDrum by Bleep Labs fits perfectly in the light funnel. In the video, the BleepDrum is hooked up to the external speaker. The Light Trigger module was set to "Dark" mode, since the LED is just a short pulse, which does not sustain the note on the sequencer.
Play with different light sources. You may need to switch the Light Trigger mode between Light and Dark, as well as adjusting the sensitivity of the sensor.
Have fun making awesome beats!