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Randolon is a software instrument developed  by Charles-Edouard Platel to give rhythm to some of his musics: for example the dynamism of "the Cycle of Life" in the "Acousmatic Transmutations", the natural fluctuations in the thirteen "Anachronistic Poems " , the baffling ballet of the "Persisting Objects" or the flows of clinking sounds in "Very Far Very Close". The instrumental music for the video "Badinage for four hands" was composed entirely by Randolon.

This software is a prototype, designed for experimental music . Creative Commons Attribution – No Commercial Use.

It is based upon the Max/MSP/Jitter engine, primarily designed at IRCAM and currently distributed by Cycling 74.


randolonThe Randolon prototype

Download of the Randolon application and documentation (version 2, needs Max/MSP from Cycling '74):

version 2.04bits (.mxf) for MacOS and Windows


From the theory...

The idea of designing Randolon came from a need to master the composition of music not based on regularity of rhythm. The reflection behind this need is presented in this article: Anachronistic music.

The part 1 of the book "Imaginary Music" presents a sound analysis baseline operating on three dimensions: duration, presence and color.
The chapter 5 proposes to listen to the sound objects by reference to these three dimensions and, by analogy to the visual world, to identify continuous, quantized, fractal or random forms and their combinations. In return, this taxonomy can be useful to describe aesthetic intentions about the sounds and so compose musics. the practice

To compose electro-acoustic pieces on a computer, musicians often rely on an off-the-shelves audio production software, like Pro Tools (Avid), Live (Ableton), Logic Pro (Apple), Cubase (Steinberg), Reason (Propellerhead), etc. . Addressing various users, these tools (DAW: Digital Audio Workstation) principally provide technical features to work on the audio signal: signal synthesis and processing, multitrack arrangement. Definitely, the practical fulfllment of a musical work still consists to cut and stick virtual equivalents of the former times magnetic tape rolls, of course faster and without getting one's fingers mixed up with the adhesive tape. The comfort and the accuracy is much improved, but the methodologic leap is short, the work remaining laborious to stay far from the standardized  models. For example: to put on an audio track some dozens of sound objects in an artistically irregular way is tedious and delicate to succeed.

The Randolon first idea is to act at a level more generic than this of the audio signal, that is by providing the machine with intended aesthetic parameters, the machine having to translate them into technical parameters, then into audio signals. These intended aesthetic parameters are based upon the duration/presence/ color model proposed by "Imaginary Music".

The second idea is, rather than to delegate the inspiration to a sophisticated but impersonal algorithmic tool, to make the musician constantly drive the parameters according to his feeling, in feedback. All the controls can be operated within the same window. The purpose is definitely an instrumental approach, and not to make music by intelligent or unintelligent robots.

The third idea is to continue to base on a standard production software to make the sounds and to perform the tracks arrangement, in deriving the technical parameters from a musical parameters mapping, thanks to scaling previously defined by the Randolon user.

What Randolon does?

Most audio production software provide features to control their virtual synthesizers (samplers, modellers, vocoders, etc. ) through a MIDI control flow, typically sent by connected keyboards and sequencers. Randolon takes the place of a sequencer to produce a flow of controls towards MIDI channels, each one being dedicated to a virtual synthesizer and an arrangement track. So the sound objects making remains ar the level of  the efficient audio functions provided by the production software and its plugins, while the arrangement of the objects across space and time is driven from Randolon.

To summarize, Randolon is a sequencer which organizes itself on the basis of aesthetic decisions sent at any time by the musician user.

Randolon is used by its designer to manage moments of creative spontaneity freed from its technical achievement, by implementing aesthetic schemes being simple to express but which otherwise would lead to a very harder and more complex digital audio work.

Randolon may also be used alone, as controller of an external or internal synthesizer, like a real-time sequencer for live music.

Musical principles of Randolon

The principles rely on the duration/presence/color baseline. According to the musical project, Randolon enables to specifically organize the framework of these three dimensions to design sound objects, which are generated by a MIDI flow sent to instruments.

  • the sound object color is defined by:
    • the selection of one or several overlaying and synchronized virtual instruments; for instance, samplers operating with prepared sound-banks;
    • one or several pitches, constrained in a tonal scale or not;
  • the sound object presence is defined by the sound intensity and the spacial position, in a predefined evolution area.
  • the duration dimension includes:
    • at the basic level, the sustain duration of every note,
    • at the sequence level, the relative time distances between the sequence steps, 
    • at the global level, the rhythm of production of the events.

Randolon relies on a recitative time progress, i.e. a sequence stream (analog to the verses of a poem) made of steps (analog to syllables).  Two rhythmic levels result from this:

  1. the swing, related to breathing, which rules the sequence cycle starts;
  2. the pulse, which rules the steps within a sequence.

The classical bar is not managed by Randolon, because it addresses only the specific case where, the sequence being contiguous, the pulse comes down to proportional fractions of the swing.

The musician works in real-time on the sound pattern settings. A setting includes a repeatable framework and automatic variation ranges of the parameters inside this framework.
The variations are from four types:

  • smooth progression, by a periodic continuous modulation,
  • turbulent, by a random scattering under fluidity and limits constraints,
  • fractal progression, by recursive repetition of a pattern,
  • sequence variations derived from serial transformations.

Randolon may also be simply used as a basic sequencer in disabling all automatic variation settings, or, without enabling any sequence cycle, as a random music generator.

Works are re-usable:

  • function to record the MIDI flow in a hard-disc file, and play-back the MIDI files;
  • the user interface settings can be archived into a library to be re-used.

Works made using Randolon:

Anachronistic Poems

Persisting Objects

Very Far Very Close

Badinage for four hands

Symphony The Forest

Charles E.Platel,
(March 2013)

Streaming & download

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