pycodedj 0.2.1

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PyCodeDJ

日本語版 README はこちら · Full Manual (EN) · マニュアル (JA)

A live-coding environment that translates Python code structure into music in real time. Every save changes the performance.

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Concept

PyCodeDJ connects "writing code" directly to "making sound."

Add more functions and the polyphony widens. Deepen nesting and the filter opens up. Fill in comments and the space grows. The structure of your code is the instrument.

Two things set it apart from existing Python ↔ SuperCollider bridges (sc3nb, supriya):

• Hot-reload performance — swap out a loop without stopping it. Saving a file becomes an immediate sound change.
• Audible code structure — structural features extracted via AST analysis (depth, branch count, function count, etc.) are automatically mapped to musical parameters.

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Architecture

[Python engine]  →OSC→  [SuperCollider]  →audio out→  speakers
      ↓ OSC
  [Hydra etc.]  →video out→  screen

Layer	Role	Technology
Control	Code analysis, scheduling, OSC dispatch	Python 3.10+, python-osc, watchdog
Audio	Real-time sound synthesis	SuperCollider (scsynth)
Visual	Music-synced visuals	Hydra or Pyxel

BPM clock is held by SuperCollider's TempoClock. Python only sends parameter updates over OSC; timing accuracy is delegated to SuperCollider.

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Code Structure → Music Parameter Mapping

Code feature	Music parameter	Musical rationale
Max nesting depth	Filter Cutoff (200–4000 Hz)	Deep structure = complexity = brightness
Control-flow count (if/for/while)	LFO rate (0.1–5.0 Hz)	More branches = faster modulation
Function definition count	Polyphony voice count (1–4)	Functions = independent voices
Comment ratio	Reverb depth (0.0–0.8)	More whitespace = more space
volume= argument	Amplitude (0.0–1.0)	Direct performer control over loudness
eq= / low= / mid= / high= arguments	Simple 3-band EQ	Per-loop tone shaping

Tempo (BPM) and root pitch are controlled explicitly by the performer, to prevent the foundation of the piece from shifting on every save.

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Installation

Requirements

• Python 3.10 or later
• SuperCollider (with scsynth available)

pip install 'pycodedj[watch]'

The [watch] extra enables the pycodedj watch command.

Development install:

git clone https://github.com/yourname/pycodedj
cd pycodedj
pip install -e ".[dev]"

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Quick Start

1. Boot SuperCollider and load the synths

Open sc/synths.scd in the SuperCollider IDE and evaluate it.

2. Write a live-coding file

from pycodedj import loop

@loop("bass", interval=2.0)
def bass(volume=0.4):
    for i in range(8):
        if i % 2 == 0:
            pass

@loop("melody", interval=0.5)
def melody(volume=0.3):
    x = 1
    y = 2
    return x + y

@loop("pad", interval=4.0)
def pad(volume=0.15):
    # make space
    # a little more
    pass

3. Evaluate a block

pycodedj eval demo.py::bass

On success, feedback is printed immediately:

[pycodedj] bass  cutoff=418Hz  lfo=1.08Hz  reverb=0.00  voices=1  amp=0.40

Other loops keep playing without interruption.

4. Live-code with watch mode

Instead of running eval manually, use watch to re-evaluate all loops on every save:

pycodedj watch demo.py

From here, just write code and save.

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Example Files

File	Contents
examples/demo.py	Intro demo with bass / melody / pad
examples/club_set.py	EDM groove (8 loops, kick → acid bass → rave stabs → hoover → shimmer)
examples/sound_showcase.py	All 30 synths — evaluate one at a time to audition each sound

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Live-Coding Examples

Deeper nesting opens the filter

from pycodedj import loop

@loop("bass", interval=2.0)
def bass(volume=0.4):
    for i in range(4):       # control flow +1
        for j in range(4):   # depth +1, control flow +1
            if i == j:       # depth +1, control flow +1
                pass

More functions = more polyphony

from pycodedj import loop

@loop("chord", interval=1.0)
def chord(volume=0.2):
    def voice_a(): pass
    def voice_b(): pass
    def voice_c(): pass
    def voice_d(): pass

More comments = more space (reverb)

from pycodedj import loop

@loop("pad", interval=4.0)
def pad(volume=0.15):
    # leave space here
    # a little more
    # silence is music
    pass

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OSC Address Reference

Addresses used to communicate with SuperCollider.

Address	Type	Range	Parameter
/pycodedj/loop/<name>/params	int, float, float, float, float	see parameter order	voice_count, cutoff, lfo_rate, reverb, amp
/pycodedj/loop/<name>/cutoff	float	200–4000 Hz	Filter Cutoff (compatibility)
/pycodedj/loop/<name>/lfo_rate	float	0.1–5.0 Hz	LFO rate (compatibility)
/pycodedj/loop/<name>/reverb	float	0.0–0.8	Reverb depth (compatibility)
/pycodedj/loop/<name>/voice_count	int	1–4	Polyphony voice count (compatibility)
/pycodedj/loop/<name>/amp	float	0.0–1.0	Amplitude (compatibility)

<name> is the loop name (e.g. bass, melody). Each loop has its own address namespace, so multiple loops never overwrite each other's parameters.

External visualisers such as Hydra can receive the same parameters on a separate port.

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Requirements

• Recommended OS: macOS (low-latency Core Audio) or Linux (Raspberry Pi 5, etc.)
• Python: 3.10 or later
• SuperCollider: 3.12 or later

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Roadmap

• Spec design and mapping design
• Phase 0: Listening validation of mapping hypotheses
• Phase 1: Python → SuperCollider OSC prototype
• Phase 2: Hot-reload live loop implementation (pycodedj watch)
• Phase 3: Hydra visualiser integration

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License

MIT + Commons Clause — free to use, modify, and perform (including paid live performances). Selling or commercially distributing the software itself is not permitted. See LICENSE for details.