Vintage FM: Swapping Bricks for Loaves of Bread

it_speaks

I recently picked up an eighties vintage Yamaha TX81Z FM synthesizer. I’ve always loved the sound of frequency modulation synthesis, but like many of us, lacked the patience to do the programming; especially since most FM synthesizers have hundreds (thousands for the Yamaha FS1R) of parameters that one is expected to edit via a few buttons and a thirty two character LCD.

Understandably FM has largely taken a backseat to subtractive synthesis, wavetable synthesis, and sampling. In the 80s FM was great because memory was expensive. Bell tones, plucked instruments, strings, and brass could be simulated by cleverly selecting an algorithm and adjusting the frequency, levels, and envelopes of the carrier and modulator operators. The price of that sound quality was handling the complexity of the instrument and the time investment that that required.

Soon memory fell in price and the cost of sampling and wavetable synthesizers dropped with it. By the mid-90s the broad popularity of FM synths like the Yamaha DX7 had given way to samplers, ROMplers, and wavetable synths. Perhaps we were attracted to the realism of sampling, or the uncanny quality of pitching familiar sounds into unfamiliar territory. But, all of these synthesis technologies have their place, and what makes FM synthesis relevant to this day is not simulating brass or bell tones, but its ability to uncover new sonic palettes through the complexity of maths, parameters, and algorithms versus the brute force of digital memory banks.

So, how do we navigate this world of nearly infinite possibilities? There are many approaches to this dilemma. Software editors are available, and FM synthesizer plugins like Ableton’s Operator and Native Instruments FM8 are much, much easier to program than their hardware counterparts. All while maintaining flexibility and sonic range. FM8 can load DX7 patches, morph between sounds, or randomize parameters. My approach to this experiment was to exploit a hardware instrument (the TX81Z) already limited by its design.

fm_degradation

I composed this piece by designing a Max for Live process to “degrade” patches in the the Yamaha TX81Z over time. The TX81Z is fairly simple within the scope of FM synths. However, the spectrum of sound is still vast thanks to a few clever features; each of the four operators can have one of eight waveforms, while older FM synths only had sine waves. The degradation process occurs as shuffled parameters in the synth are randomized at a specified pace. Imagine pulling bricks out of a wall and then replacing them with things like a loaf of bread, Legos, or a shoe. The degradation can be interrupted at any moment by the performer to “freeze” a patch for later use, or looped to generate chaotic textures that morph continuously. This excerpt stacks two layers of the degradation process with some panning and reverb to add ambience. Based on these results I anticipate that a lot more is available to be discovered through this and similar techniques. Currently I am working on a way to interpolate between the existing parameter and the “degraded” one for a more legato feel to the entropic process. Stay tuned!

Spectral Tablature (2013)

Spectral Tablature (2013)

Spectral Tablature is a series of collaborative installations that explore sound generated through visual processes. Sound is recorded or synthesized using common techniques then converted into images called spectral analysis. These forms are re-interpreted as a visual artifact then converted back into sound. For each pair, or “duet,” the similarities and differences in tone and texture can be heard as well as seen in the work. This series, along with two more of my installations, is currently on display for my thesis exhibition at the Northrup King Building in Minneapolis. Please read on for images and descriptions of each pair of prints along with the audio.
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Vortex by Ostraka

The true test of a new instrument is whether you can integrate it into your workflow and use it to produce satisfactory work. This I wasn’t so sure about after my first few hours of working with the Yamaha FS1R. The factory performance patches on the FS1R are all overloaded with effects and glitzed out to impress the ears of musicians from 1998. Despite the frustrating characteristics of the instrument’s patches, I had faith that the complexity of its FM architecture coupled with its formant shaping features made it something worth trying to tame. To produce Vortex I created the formant lead sound from the ground up, made a nice, wide stereo bass patch using a couple of DX voices, and adjusted a melody patch to my taste. The percussion and arpeggios were programmed and played on the DSI Tempest.

Yamaha FS1R Formant Sequencer Ra Re Ri Ro Ru

reriraroru

This short experiment was produced by programming a custom formant sequence into the infamous Yamaha FS1R. This is not possible to do with the unit alone, but there are some great tools that make it possible that I’ll discuss an upcoming article. A formant sequence essentially modulates the formant shaping operators on the FS1R modeled after the spectra from am audio signal. This patch repurposes a vocal track from my project Voice Lessons as the formant sequence.

Ra Re Ri Ro Ru FS1R Formant Sequence

Perihelion Dub

Here’s a piece dedicated to our planet’s recent astroid near miss and “unrelated” spectacular meteor explosion. I went back to my roots and produced some psychedelic, dub-delayed business with a little arabesque-miami-vice in the middle. Please enjoy responsibly.