Invisible instrument - tuning the inputs

Each input in the invisible instrument triggers samples by detecting a change in light above a sensor. Because different rooms have different light levels (and light levels can change across a small space in the same room) each input can be adjusted to make it more or less sensitive to the amount of light it is receiving.
To do this, we have put a potentiometer on each input which the user can adjust to get the best results.

Invisible instrument - guitars

This time we're using the invisible instrument to trigger guitar riff samples.
Although not as immediately useful as, say, an invisible drum kit, the ability to play riffs instead of single notes will become more useful once we've added multi-channel support (play multiple samples from a single input) and MIDI output.

Invisible instrument - drums

Here's a project that was supposed to be a simple two-day thing that ended up taking a couple of weeks to get right. It's the opposite of a light/laser harp: instead of detecting reflected/broken light beams, this instrument "sees" shadows as you pass you hand over the sensors. Wave your hand about and trigger wav/mp3/ogg samples.
In this demonstration, we're using it to trigger drum samples, recreating a simple invisible drumkit