Category Archives: GMS

The GMS (Gestural Music Sequencer), written in Processing.org by Unearthed Music recording artist and AudioCookbook.org founder John Keston, analyzes video input and converts it into a sequence of musical information in real-time. Each frame is processed to find the brightest pixel. The x coordinate is converted into pitch while the y coordinate is translated into dynamics. The application was also designed to use probability distributions on pitch and durations.

GMS Drum Solo

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To create this silliness I set the GMS to play the drums on the built in Java Sound Synthesizer. I adjusted the tempo and duration probabilities to something ridiculous then captured the output on my PCM-D50. Since this experiment I have made a few more that are even more high speed and scattered. Perhaps I’ll post more examples of this nature. I have rare instances of longer durations inabled in the probability distribution, so as you’re listening, every so often you may think that it’s over (finally!) when suddenly it starts up again with obnoxiousness.

GMS Drum Solo

Sixty Fourth Notes from Twenty BPM to One Thousand and Back

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I’ve already posted a few glitchy sounds created by the GMS in it’s various states of development. Most of them created by some bug, which I love. Serendipity never looses its charm for me. This sound is more deliberate and illustrates how sixty fourth notes sound played on a basic piano sample from twenty beats per minute all the up to nine-hundred and ninety-nine BPM. I’m not sure how accurately the GMS is reproducing these durations at tempos greater than five-hundred beats per minutes, but it sounds pretty wicked anyway.

From 20bpm to 999bpm and Back

External Sync Feature Added to the GMS

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With some expert help from Grant Muller I have successfully added the capability of synchronization with an external MIDI signal to the GMS. This feature opens up vast possibilities for performance and collaboration with the tool. To test the feature I sent external sync from Ableton Live to the GMS, which in turn routed note information back through the IAC drivers into Ableton to drive a VST FM synth. I started by live looping a few phrases from the sequencer including a bass line, mid-range arpeggio, and some heavily delayed FM clav, then put it together with a recycled beat into a two minute micro-track. Everything heard, except the drums, are notes output from the GMS via video stimulus.

GMS External Sync Test

Chromatic Currents Part II

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This second part to “Chromatic Currents” was produced with the GMS by using a string of lights placed into a large glass vase. I moved the camera around the vase to direct the flow of musical phrases with one hand while I adjusted transposition and note duration settings in the sequencer with my right.

You might notice that the video stimulus does not resemble lights in a vase. This is because I applied a negative filter to the video after capturing the performance. Once again I used a pleasant pentatonic scale interspersed with rare dissonant notes and probability distributions in the note durations to give it an eerie awkwardness.

GMS: Chromatic Currents Part II from Unearthed Music on Vimeo.

 

Chromatic Currents Part I

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Here’s a segment of sound from another GMS video I produced yesterday called Chromatic Currents. Once again I was letting the visuals drive the piece, while I controlled parameters in the GMS. On Sound Globules I used the circle of fourths with probability distributions so that C was the most frequent note followed by F, Bb, Eb and so on. I really liked the rare dissonant pitch making its way into the sequence, so I tried a similar technique for Chromatic Currents. The scale was strongly C minor pentatonic, weighted with the Dorian mode by adding less-likely probabilities for D and A. However, every note that was not part of the scale still had a small possibility of occurring. This led to occasional blue or dissonant pitches in the stream of notes. The possibility of having any note within a chromatic scale occur in the stream led me to the title.

Chromatic Currents