Quick Reference

Pattern Syntax

Syntax	Name	Description
`[a b c]`	Sequential	Elements play one after another
`[[a b] c]`	Nested	Inner group subdivides time slot
`[a, b]`	Parallel	Elements play simultaneously (chord)
`<a b c>`	Alternating	One element per cycle, rotating

[C4 D4 E4]              // C4 then D4 then E4
[[C4 D4] E4]            // C4-D4 in first half, E4 in second
[C4, E4, G4]            // C major chord
<C4 D4 E4>              // Cycle 1: C4, Cycle 2: D4, Cycle 3: E4

Compact Notation

Modifier	Name	Description
`*n`	Fast	Repeat n times within slot
`@n`	Weight	Extend duration to n slots
`!n`	Replicate	Create n separate slots
`(k,n)`	Euclidean	k hits distributed over n steps
`(k,n,r)`	Euclidean rotated	Rotated by r steps

[bd*4]                  // Four kicks in one slot (16ths)
[C4@2 D4]               // C4 gets 2/3 time, D4 gets 1/3
[C4!4]                  // Equivalent to [C4 C4 C4 C4]
[bd(3,8)]               // 3 kicks spread over 8 steps
[sd(5,8,2)]             // 5 snares over 8 steps, rotated by 2

Pattern Methods

Method	Description
`.length()`	Number of elements
`.reverse()`	Reverse order
`.rotate(n)`	Shift left (positive) or right (negative)
`.transpose(n)`	Pitch shift by n semitones
`.concat(pat)`	Append another pattern
`.fast(n)`	Speed up by factor n
`.slow(n)`	Slow down by factor n
`.stack(pat)`	Layer with another pattern
`.degrade(p)`	Randomly drop notes (0.0-1.0)
`.nudge(offsets)`	Per-step timing offsets
`.swing(amount)`	Swing timing feel
`.humanize(amount)`	Deterministic timing variation

[C4 D4 E4].reverse()           // [E4 D4 C4]
[C4 D4 E4].transpose(12)       // Up one octave
[C4 D4].concat([E4 F4])        // [C4 D4 E4 F4]

Commands

Command	Description
`PLAY`	Start or resume playback
`PAUSE`	Pause playback (resume with `PLAY`)
`STOP`	Full stop (resets position, mutes audio)
`RECORD`	Start playback and record on armed tracks
`SEEK expr`	Jump to a cycle position
`PRINT expr`	Print value with newline
`PUT expr`	Print value without newline
`let x = value`	Declare variable
`x = value`	Reassign variable

Tracks

// MIDI track (channel 1-16, optional velocity 0-127)
let track = MidiTrack(1);
let track = MidiTrack(10, 100);     // Channel 10, velocity 100

// Audio track with sampler
let drums = AudioTrack("drums");
drums.load_instrument(Sampler(Kit("cr78")));

// Retrieve loaded instrument for parameter tweaking
let kit = drums.get_instrument();

// Send pattern to track
track << [C4 D4 E4];
drums << [bd sd bd sd];

Routing

Method / Operator	Description
`<<`	Send pattern to track
`>>`	Route audio between tracks
`.send_to(dest, amount)`	Additive send (dry stays at 1.0)
`.xsend_to(dest, amount)`	Crossfade send (dry = 1.0 - amount)
`.send(amount)`	Create Send value for `>>` chains
`.send_level(dest)`	Send param ref for automation
`.reset_routing()`	Clear routes, restore default master route
`.routing()`	Print track routing info
`routing()`	Print full routing graph

drums >> master;
drums.send_to(reverb_bus, 0.3);
drums >> reverb_bus.send(0.3) >> master;

Effects

Effect constructors are part of the prelude and available globally — no import needed.

Constructor	Description
`Delay(time, feedback)`	Delay (0.25s, 0.5)
`Lowpass(cutoff, resonance)`	Low-pass filter
`Highpass(cutoff, resonance)`	High-pass filter
`Bandpass(cutoff, resonance)`	Band-pass filter
`Notch(cutoff, resonance)`	Band-reject filter
`Allpass(cutoff, resonance)`	Phase-shift filter
`Peak(cutoff, resonance)`	Bell/EQ filter
`Reverb(room, damp, width, mix)`	Freeverb reverb
`PlateReverb(size, damp, diff, pre, mix)`	Dattorro plate reverb
`Overdrive(drive, tone)`	Tube-style soft clipping
`Distortion(drive, tone)`	Transistor-style hard clipping

drums.load_effect(Delay(0.25, 0.7));
drums.load_effect(Lowpass(800));

Effect Management

Method	Description
`.load_effect(fx)`	Add effect to track chain
`.load_effects(#[...])`	Add multiple effects
`.effects()`	List loaded effects
`.swap_effects(i, j)`	Swap effect order
`.remove_effect(i)`	Remove and return effect
`.clear_effects()`	Remove all effects

drums.load_effect(Reverb(0.5, 0.3));
drums.load_effects(#[Lowpass(800), Delay(0.25, 0.5)]);
drums.swap_effects(0, 1);

CR-78 Kit Samples

Short	Sample	Short	Sample
`bd`	Bass drum	`cb`	Cowbell
`sd`	Snare	`ma`	Maracas
`hh`	Hi-hat	`tb`	Tambourine
`cy`	Cymbal	`gu`	Guiro
`cp`	Clap	`hb`	High bongo
`rs`	Rimshot	`lb`	Low bongo
`me`	Metal beat	`lc`	Low conga
`cl`	Clave

Sample Methods

Velocity:

Method	Velocity	Description
`.vel(v)`	Custom	Set velocity (0 to infinity)
`.ghost()`	0.3	Ghost note (quiet)
`.soft()`	0.5	Soft hit
`.accent()`	1.0	Accented hit
`.loud()`	1.2	Loud hit

Transformations:

Method	Description
`.slice(start, end)`	Play portion of sample (0-1 range)
`.reverse()`	Play sample backwards
`.pitch(semitones)`	Pitch shift sample
`.pan(position)`	Stereo position (-1.0 to 1.0)

drums << [bd.loud sd.soft];
drums << [bd.pan(-1) sd.pan(1)];
drums << [bd.pitch(12) sd.reverse()];

Notes

Notes use scientific pitch notation: C4 is middle C.

Range: C-1 to G9
Sharps: C#4, D#4, F#4, etc.
Flats: Db4, Eb4, Bb4, etc.
Rest: _ (underscore)

Control Flow

if condition { }
if condition { } else { }

loop { break; }
do 5 { }
for x in Array(1, 2, 3) { }
for i in range(5) { }

Functions

fn name(param1, param2) {
    return value;
}

// Anonymous function
let double = fn(x) { return x * 2; };

// Higher-order
arr.map(fn(x) { return x * 2; });
arr.filter(fn(x) { return x > 0; });
arr.reduce(fn(acc, x) { return acc + x; }, 0);

Dictionaries

let d = #{"key": value, 200: "OK"};
d["key"]                   // Access
d.get("key")               // Access (NUL if missing)
d.set("new", val)          // Mutate
d.keys()                   // Array of keys
d.merge(other)             // New merged dict

Match

match value {
    1 => "one",
    n if n > 10 => "big",
    _ => "other",
}

Streams & Script Patterns

stream(initial, fn(prev, cycle) { ... })
markov(states, transitions, initial)

class MyPattern {
    fn new() { ... }
    fn query(cycle) { ... }  // Script pattern
}

Iterators

Lazy (return iterator):

Method	Description
`.take(n)`	First n elements
`.skip(n)`	Skip first n elements
`.step_by(n)`	Every nth element
`.enumerate()`	Yield `[index, value]` pairs
`.zip(iter)`	Pair elements from two iterators
`.chain(iter)`	Concatenate two iterators

Eager (consume iterator):

Method	Description
`.next()`	Next element or `NUL`
`.collect()`	Gather into array
`.find(fn)`	First match or `NUL`
`.any(fn)`	True if any match
`.all(fn)`	True if all match

let nums = Array(1, 2, 3, 4, 5);
nums.iter().skip(1).take(3).collect();   // [2, 3, 4]
nums.iter().any(fn(x) { return x > 4; });  // true

Randomness

rand(seed)                          // Deterministic [0, 1)
choose(seed, array)                 // Deterministic pick
choose_weighted(seed, arr, weights) // Weighted pick
rand_true()                         // Non-seekable
choose_true(array)                  // Non-seekable

Music Theory

Scale("major")                      // Built-in scale value
Scale(#[0, 2, 4, 5, 7, 9, 11])     // Custom scale from semitones
s.mode(2)                           // Rotate to nth mode
s.intervals()                       // Interval array
s.contains(7)                       // Check interval membership
scale(C4, "major")                  // Array of scale notes
scale(C4, my_scale)                 // Also accepts Scale values
scale_degree(C4, "major", 5)       // G4
Key(C4, "major")                    // Key from string
Key(C4, Scale("major"))             // Key from Scale value
chord(C4, "min7")                   // Array of chord notes
chord(C4, "major", 1)              // First inversion
interval(C4, "P5")                  // G4

Signals

Constructor	Range	Description
`Sine(n)` / `Sine2(n)`	0-1 / -1 to 1	Sine wave
`Saw(n)` / `Saw2(n)`	0-1 / -1 to 1	Sawtooth wave
`Tri(n)` / `Tri2(n)`	0-1 / -1 to 1	Triangle wave
`Square(n)` / `Square2(n)`	0-1 / -1 to 1	Square wave
`Rand(n)`	0-1	Random noise
`Perlin(n)`	0-1	Smooth Perlin noise

All accept: no arg (1 cycle/cycle), number (N cycles/cycle), or hz(n) (absolute frequency).

Method	Description
`.range(min, max)`	Linear mapping to [min, max]
`.range_exp(min, max)`	Exponential mapping (for frequencies)
`.retrigger(mode)`	Phase reset: `"cycle"`, `"beat"`, `"free"`
`.smooth(time_ms)`	One-pole lowpass smoothing

Signal Algebra

Operator	Example	Description
`+`	`Sine(1) + Saw(3)`	Sum signals
`-`	`Sine(1) - Tri(2)`	Subtract signals
`*`	`Sine(1) * 0.5`	Scale / ring mod
`/`	`Sine(1) / Saw(2)`	Divide signals
`-` (unary)	`-Sine(1)`	Negate

Sine(4).range(0.2, 0.8)            // LFO with range
Sine(1).range_exp(20, 20000)       // Exponential for freq
(Sine(1) + Saw(3)) * 0.5           // Mix two LFOs
Sine(2) * 0.3 + 0.5                // Scale + offset
Cc(74).smooth(50)                   // MIDI CC signal

Automation Curves

Curve	Description
`"linear"`	Straight line (default)
`"step"`	Instant jump
`"exp"`	Exponential curve
`"smooth"`	Smooth interpolation
`"ease-in"`	Slow start, fast end
`"ease-out"`	Fast start, slow end
`"ease-in-out"`	Slow start and end
`"ease"`	CSS-style ease
`"bezier(x1,y1,x2,y2)"`	Custom cubic bezier

automation(#[0, 0], #[2, 1.0, "exp"], #[4, 0])
d.Feedback.modulate(#[0, 0.3], #[4, 0.9]);

Microtiming

pattern.nudge([0, 0.25, 0, -0.1])  // Per-step offsets (step-relative)
pattern.swing(0.25)                 // Swing feel
pattern.humanize(0.1)               // Human touch

Arrangements

Call	Description
`timeline(length)`	Create a fixed-length timeline
`.at(start, duration)`	Create a slot at cycle offset
`.length()`	Get timeline length in cycles
`.entries()`	Get number of entries

let t = timeline(16);
t.at(0, 8) << [bd _ sd _];         // Verse
t.at(8, 8) << [bd*4];              // Chorus
drums << t;                         // Assign to track

Rendering

Call	Output
`render(cycles)`	Master mix
`render(track, cycles)`	Single track
`render(#[tracks], cycles)`	Multiple tracks

render(#[drums, bass, master], 4);

Audio Input

Method / Command	Description
`.input(device)`	Route audio input device to track
`.arm()` / `.disarm()`	Arm/disarm track for recording
`.monitor("in"/"off")`	Enable/disable input monitoring
`RECORD`	Start playback and record armed tracks
`.take()`	Retrieve last recording
`.duration()` / `.samples()`	Recording info
`.save("path")`	Save recording to WAV

let mic = AudioTrack("mic");
mic = mic.input("MacBook Pro Microphone");
mic = mic.arm().monitor("in");
RECORD;
// ... perform ...
PAUSE;
mic.take().save("recording.wav");

Project & Tempo

Function	Description
`setbpm(bpm)`	Set tempo (4 beats per cycle)
`setbpm(bpm, beats)`	Set tempo with custom beats per cycle
`project_title(title)`	Set project title
`project_artist(artist)`	Set artist name
`project_bpm(bpm)`	Set project BPM

MIDI Input/Export

midi_input_connect("port", "alias")
track.input("alias").monitor("in")
midi_export(pattern, 4)             // Export to MIDI file

MIDI Clock

Function	Description
`midi_clock_send(bool)`	Enable/disable master clock output (24 PPQ)
`midi_clock_follow(alias)`	Sync to external clock on input port
`midi_clock_offset(ms)`	Clock-only timing offset
`midi_delay(ms)`	Global MIDI output delay

midi_clock_send(true);
midi_delay(15);

Plugins

plugin_scan()
plugin_list()
let fx = Effect("name")
fx.params()                       // prints parameter table
fx.set_param("Cutoff", 2000)      // set by actual value
fx.set_param_norm("Cutoff", 0.5)  // set by normalized 0-1 value
fx.save_state("preset.preset")

CLI Reference

Subcommand	Description
(none)	Start REPL or run a `.non` file
`server`	Start WebSocket server for remote execution
`view <name>`	Launch TUI view (`console`, `mixer`, `routing`, `midi_monitor`)
`version`	List, show, or switch installed versions
`plugin`	Scan or list CLAP plugins
`pkg`	Install, list, or inspect packages

resonon server --server-port 6000
resonon view mixer
resonon plugin scan

Configuration

Config file: ~/.config/resonon/config.toml

Section	Key options
Top-level	`lib_paths`, `kit_paths`, `cycle_time`, `viz_resolution`
`[audio]`	`output_device`, `input_device`, `sample_rate`, `master_channels`
`[midi]`	`output_port`, `input_port`
`[[midi.outputs]]`	`alias`, `port` (named output ports)
`[[midi.inputs]]`	`alias`, `port` (named input ports)

See Configuration Reference for full details.

Package Management

resonon pkg install gh:user/repo
resonon pkg list
resonon pkg inspect name

VSCode Shortcuts

Shortcut	Action
`Cmd+Enter`	Execute selection or line
`Cmd+Shift+Enter`	Execute entire file