“Some Time Back”

I was talking, some time back, with a friend of mine about my fascination with buffers in the making of music, with the way digital memory access has become a normal function of sound production. One doesn’t simply play the sound of the moment, with the pluck of a string or the touch of a key on keyboard; one can reach back into the recent past and play something that has already occurred. Furthermore, if we gain a sense of ease in that prior moment, we can linger there, essentially inhabit that pre-moment moment for the length of the performance, and occasionally reach into the future to play that which has, in effect, not yet happened.

My friend, Mahlen Morris, has been developing virtual synthesizer modules for the freely available VCV Rack program. He does so under the splendid name Stochastic Telegraph. He got to thinking about what we were discussing, and began crafting not just one module but a suite of (currently) four modules that can be combined as one sees fit in order to create the memory-access tool of that best suits one’s imagination.

This video is a test run I made of Mahlen’s new tools. The source audio is a sample from a sample set by Lullatone, just a glistening tonal loop that plays on repeat. (It’s the first track off their Bowed Glockenspiel sample set, released back in September 2021.) That loop, 49 seconds long, is housed in that narrow little module to the left of the module labeled Memory. Memory and the five modules to its right are the ones that Mahlen is developing.

In a brief and far from comprehensive summary:

“Memory” contains the audio“Depict” shows the waveform that represents not just the recording but the play heads (left hand horizontal lines) and record heads (right hand horizontal lines)“Ruminate” accesses and plays the audio (there are three modules doing that work here)“Embelish” is the record head.

Even though I have checked in with Mahlen during his development work, I am still myself in the early stages of using these, so I am probably describing some of this incorrectly. (And they are capable of far more than I do or describe here.)

In this video, two of the play heads, the red and blue ones, are traveling at twice the speed of the third play head, which is yellow. This creates an octave gap. For the first 30 seconds, that’s all that is happening. The Embellish module (the purple line on the right side) is recording to the buffer continuously from the Lullatone sample, and those three heads (red, blue, yellow) are accessing it in different ways. The lowest pitched of the play heads, the yellow one, is in “bounce” mode, meaning it plays backwards when it reaches the top. The others start again at the start — though to be clear, the buffer here isn’t constant; it’s being written over from the sample, which itself is looping.

At 30 seconds, I click the start button on the trigger sequencer, called “Algorhythm,” and it plays a simple eight-bar beat in which the third and sixth beats are silent. Each triggered moment causes the red bar to briefly play. Previously it was playing continuously; henceforth it will just play for a split second when triggered. Because it’s always accessing the same source sample, just in different places, it ends up producing a little melody where all the pieces are in tune with each other.

At 1:08, having set a melody of sorts into motion, thanks to the rhythmic consistency, I hit the random button on the Algorhythm module, which makes the remainder of the piece more abstract than what came earlier.

That’s it, three stages of the source audio: first the playback heads on their own, then the introduction of those precise little notes, and then the further randomization of the rhythmic appearance of those notes.

The other modules employed are rudimentary. “Clock” sets the pace. “RND” is a random trigger that sets where the little red play back head lands. “Push” sets the sample running (the player loops continuously — or, in the module’s compressed terminology, “cycle”s it continuously). The “Mixer” combines the three stereo channels. The “Audio” sends the sound out my laptop’s speaker. And the “Record” let me record this video.

Mahlen’s modules aren’t available yet, but they will be soon.