Tag: pure data

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Pd Patch from Scratch: Ring Modulation and Filterbank

A quick and easy Pure Data patch-from-scratch tutorial building another feedback loop with a delay and a ring modulator, this time with a fixed filter bank.

Inspired by the music of Jaap Vink, with three sine waves, a filterbank, a delay, and some feedback, we can make some slow evolving-complex and dynamic sounds.

In this patch we take a sine wave, ring modulate it, then ring modulate that result before running into a filterbank, delay, and then feeding it back on itself.

There’s no talking on this one, just building the patch, and listening to it go.

More feedback loops (in analog):

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Subharmonics in Pure Data

Quick and easy Pure Data tutorial, making chords from subharmonics (like the Moog subharmonicon). The result is a kind of Coltrane-y generative music system.

Subharmonics are whole-number divisions of a frequency (as opposed to regular harmonics, which are whole-number multiples of a frequency). The resulting “subharmonic series” (or “undertone series”) is an inversion of the overtone series, with subharmonics getting closer the lower (i.e. higher division) that they are. Played together, these harmonics create harmonies quite distinct from those created with overtones.

I go up to the 9th subharmonic here, but of course you can just keep going.

There’s no talking on this one, just building the patch, and listening to it go.

More Pd Tutorials Here

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Asymmetrical Clipping in Pure Data

Asymmetrical clipping is clipping (truncation of a waveform), where the positive and negative amplitude peaks of a waveform are clipped to different values. This means we could clip the negative at -1, and the positive at -0.8 for example, and create some interesting harmonics.

This asymmetrical clipping is common in guitar effect pedals, since it’s relatively cheap to accomplish in electronics (with a few diodes). Unsurprisingly, it’s pretty easy to accomplish in Pd too, just using the [clip~] object. The fun part comes in deciding how we can use it musically.

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Pure Data Ring-Modulation Delay

A quick and easy Pure Data patch-from-scratch tutorial building a feedback loop with a delay and a ring modulator.

With just two sine waves, a delay, and some feedback, we can make some pretty complex and dynamic sounds! In this patch we take a sine wave, delay it, and then ring-modulate that delay before feeding it back on itself (feeding it back into the delay, that is).

There’s no talking on this one, just building the patch, and listening to it go.

More Pd Tutorials
More on modulation synthesis

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Understanding Mid/Side Stereo in Synthesis (Pure Data, Reaktor, and Eurorack)

Mid/Side is a different way of working with stereo, where, rather than one channel for the left, and one for the right, you have one channel for the “mid” information, and one channel for the “side”. This format allows for different approaches to stereo processing, playing with the stereo image in new and interesting ways.

I’ve seen a lot of videos about mid/side for mixing or mastering but I thought I’d talk a bit about the potential for this approach in sound design, and how it can help us think about 3D audio and ambisonics too.

Modules in the Eurorack modular demonstration:
-Winterbloom Castor&Pollux dual oscillator
-Shakmat SumDif precision adder
-Hikari Instruments Ping Filter
-Instruo Tanh saturator

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Making a “Krell Music” Patch in Pure Data (Generative Sci-Fi Music)

Putting together a music (muzak?) generator in Pd inspired by Todd Barton’s self-generating patch on the Buchla Synthesizer.

In my regular journeys across the internet, I came across the concept of a “Krell Music” patch–a self-generating patch created by Todd Barton, inspired by Bebe and Louis Barron’s soundtrack to the 1956 film “Forbidden Planet.” The Barrons’ soundtrack to the film is amazing, and a bit beyond what I can get into here (see links below). Barton’s Buchla patch tries to capture some of the dynamic timbres of that score.

My oversimplification of the idea is this: a note has an amplitude envelope–attack and release–and when that amplitude envelope ends it triggers the next envelope. At the same time, that trigger selects a new (likely different) attack and decay time, as well as a new pitch and timbre for the next note. So we create a continuous series of musical tones, each distinct from the one before it.

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Making Binaural Beats in Pure Data (Brainwave Entrainment)

Talking about binaural beats, claims about their ability to entrain brainwaves, and walking through how easy they are to make yourself in Pure Data.

In binaural beats, two pitches with slightly different frequencies are played, one in each ear, supposedly creating a vibration at the difference tone inside your head, which can be used to entrain your brainwaves to help you relax, get you high, or even affect your behavior. The science isn’t there, but that doesn’t mean we can’t embrace binaural beats as a musical aesthetic, using Pd to make a fun, free “healing music generator.”

…just as long as we use our critical thinking and our ability to find credible resources.

Please TRUST YOUR DOCTOR (not the internet, including my videos) when making your medical decisions.

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Pure Data Algorithmic Chiptunes (Pd to ArduinoBoy to Game Boy)

Pd running MIDI to an ArduinoBoy controlling a Game Boy running trash80’s mGB software to generate triumphant RPG music in real time.

This simple(-ish) Pure Data patch generates four channels of MIDI, corresponding with the four channels of the Game Boy’s sound: two pulse waves (channels 1&2), a triangle wave (channel 3), and noise (channel 4).

The arpeggio on pulse channel 2 is just a simple sequencer, with some “echos” created with [pipe] objects. The “drums” are created by a sequencer triggering random notes on a sequence too.

The remaining channels are slightly more sophisticated. First, we select a rhythm for each measure, then trigger notes on pulse channel 1 at that rhythm. There are only five notes (from a hemitonic pentatonic scale), and each note has two or three possible harmony notes, to be played by the triangle channel.

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Pure Data Tutorials for Musicians

Over the last year, I’ve put together a collection of YouTube videos on Pure Data Vanilla for musicians with no previous programming experience required.

Originally, I was just making these videos for a class, but I quickly found there was an audience for Pd tutorials like this, and my videos expanded beyond the class materials to generative music patches, live databending glitch beats, and algorithmic 80s synthwave.

If any of that sounds like fun to you, check out the playlist and enjoy!