Changelog

All notable changes to SynFlo are listed here.

0.8.4 — 2026-05-13

Added

• Sweep module — Plays a freeform polyline contour each time it receives a trigger. Like Automation, but one-shot per trigger rather than looped.
• Copy / cut / paste / duplicate for graph nodes — Standard Ctrl/Cmd C/X/V/D shortcuts, plus a right-click (long-press on touch) context menu. Internal connections between copied nodes are preserved, and the clipboard uses the .sfg patch format so you can paste across browser tabs.
• Shift-click selects along the signal path — Shift-clicking a node picks up every node lying on a path between it and the existing selection. Two clicks grab a whole branched chain — for example, Keyboard then Output pulls in Oscillator, Envelope, and Gain.
• Pin button on the toolbar — Keeps the toolbar visible instead of auto-hiding. The setting persists across reloads.

Changed

• Inspector opens on double-click, not single-click — Single-clicking a node just selects it; double-click opens the parameter inspector. Keeps the panel out of the way while copying, moving, or duplicating nodes. Escape closes the inspector without deselecting.

0.8.4 — 2026-05-13

Added

• Sweep module — Plays a freeform polyline contour each time it receives a trigger. Like Automation, but one-shot per trigger rather than looped.
• Copy / cut / paste / duplicate for graph nodes — Standard Ctrl/Cmd C/X/V/D shortcuts, plus a right-click (long-press on touch) context menu. Internal connections between copied nodes are preserved, and the clipboard uses the .sfg patch format so you can paste across browser tabs.
• Shift-click selects along the signal path — Shift-clicking a node picks up every node lying on a path between it and the existing selection. Two clicks grab a whole branched chain — for example, Keyboard then Output pulls in Oscillator, Envelope, and Gain.
• Pin button on the toolbar — Keeps the toolbar visible instead of auto-hiding. The setting persists across reloads.

Changed

• Inspector opens on double-click, not single-click — Single-clicking a node just selects it; double-click opens the parameter inspector. Keeps the panel out of the way while copying, moving, or duplicating nodes. Escape closes the inspector without deselecting.

0.8.3 — 2026-05-11

Changed

• Rock-solid timing across the control side — Beat, Step Sequencer, Drum Pattern, Clock Divider, Shift, Sample & Hold, Random, Automation, and Quantizer now keep accurate timing even when the rest of the app is busy. Previously, heavy UI work could cause beats and triggers to be silently dropped; that's gone. This extends the timing fix the envelope got in 0.8.2 to the rest of the control modules.
• Control Scope defaults to free-run — New Control Scope nodes now start running by themselves, instead of waiting for a trigger input.

Fixed

• Control Scope missed very short pulses — Narrow trigger pulses now register on the scope reliably.

0.8.2 — 2026-05-10

Added

• Sample-accurate envelope triggers — Envelope timing is now rock-solid even on fast retriggers (drum machines, percussive patches). Removes the audible variability between trigger and attack that previously made tight rhythmic patches feel loose.
• Cosine envelope curve — A new raised-cosine curve option produces noticeably softer attacks and releases than the linear and exponential options, with much less click content on percussive shapes.
• Oscillator phase-reset input — New reset input on the Oscillator restarts the waveform from zero on a rising edge. Paired with an envelope gate, this gives clean fast attacks with no startup click.
• Mixer per-channel pan — Mixer now has a stereo mode with a pan control on every channel; mono mode is preserved as the default.
• Mixer per-channel mute/solo — Mute and solo buttons on every channel strip, with solo overriding mute.
• Native save/load dialogs — Patches now save and load through the browser's native file picker where supported. Patches use the .sfg extension.

Changed

• Smoother oscillator pitch changes — Note-CV transitions are smoothed so sweeps and arpeggios no longer have audible zipper noise.
• Inspector and graph no longer glitch audio while dragging — Resizing nodes, dragging faders, or panning the canvas with a heavy panel open no longer causes audio dropouts.

Fixed

• Drum-trigger click — Percussive patches built from envelope + oscillator no longer click on each hit.
• Mixer drag stalls and accidental node selection — Dragging mixer faders no longer stalls mid-stroke, and clicking a pan control no longer selects the underlying node.
• Patches drawer left open after save — The drawer now closes automatically once a patch has been saved.

0.8.1 — 2026-04-19

Added

• Drum Pattern module — variable-track (1–8) trigger sequencer with a compact piano-roll-style pattern editor.
• Spectrum Analyser module — log-frequency bar chart from 20 Hz to 20 kHz with a pastel red-to-blue palette.

Changed

• Cleaner Square and Saw oscillators — High notes and bright timbres no longer pick up "buzzy" aliasing noise across the spectrum.
• Touch-friendly node resize — Resizing nodes now works reliably on touch devices.

Fixed

• Beat LED at fast BPM — The LED flash stays rock-solid up to 960 BPM and beyond; previously, short flashes at high tempos were missed.
• Scope trace breaking into dashes when zoomed out — Scope line now stays continuous at any canvas zoom level.

0.8.0 — 2026-04-17

Changed

• Pitch CV is now 1V/octave on note ports throughout, matching the standard modular convention. Oscillator, Keyboard, Quantizer, and Step Sequencer all speak V/oct on their note input/output. Filter cutoff remains in Hz. Note-typed params render as note names (e.g. A4) in the Inspector.
• Envelope trigger and gate inputs separated — trigger fires a one-shot ADR; gate holds the sustain phase for as long as it's held.
• Toolbar drawers stack instead of replacing each other, so patches and modules can be open at the same time.
• Audio scope trace stabilised — less jitter on continuous waveforms.
• Dropped the redundant detune CV input on Oscillator (detune remains as a param).
• Oscillator frequency can now reach zero.

Added

• Default patch on app load — a simple mini-synth with a scope wired in opens by default, so there's something to play with immediately.
• Gate output on Step Sequencer.

Fixed

• Envelope clicked when starting from silence.
• Drag-drop from the module browser sometimes created duplicate nodes.
• Live Input-control values were leaking into saved patches.
• Step Sequencer restarted when a note was edited during playback.

0.7.0 — 2026-04-13

Added

• Input category — live performance controls, each with a rich in-node UI:
  • Button — momentary gate with pressed/released trigger outputs.
  • Switch — pill toggle.
  • Slider — vertical fader with bounds and optional log scaling.
  • Knob — SVG arc with bounds and optional log scaling.
  • Pad — 2D XY touch surface.
  • Keyboard — piano keyboard emitting V/oct (see 0.8.0), with trigger and gate outputs.
• Tie notation on Step Sequencer (>) for legato/continuation notes.
• CV inputs on every numeric param that was previously missing one — every knob can now be modulated.

Changed

• Canvas background switched from grid lines to subtle dots.
• Sequencer and Quantizer default scale is now "major" (was chromatic).
• Slider track, thumb, and value label now scale with node size.
• Clicks on in-node controls no longer select the underlying node, and nodes with rich in-node UIs now open at the right size by default.
• Removed Constant module — Slider and Knob cover the same ground.

Fixed

• Sequencer click targeted the wrong cell when the canvas was zoomed.
• Sequencer grid didn't update when scale/root/octaves changed; notes are now remapped and clamped to the active scale.
• Sequencer steps param had no effect on grid size.
• Beat wouldn't stop when a run input was connected at a low level.
• Inspector overlapped Input-category nodes.
• Step Sequencer edits sometimes bounced between collaborators in a session.

0.6.0 — 2026-04-05 — Collaboration release

Added

• Real-time collaboration — open a session, share the URL or a QR code, and other people can see and edit the same patch live:
  • Live sync of node positions, sizes, parameter values, edges, and edge enable/disable across everyone in the session.
  • Presence — list of who's in the session, plus their cursors live on the canvas.
  • Collaborative patch load with a confirmation dialog so one user can't wipe the session by accident.
  • Auto-join when opening a session URL.
• Noise module split out from Oscillator (white/pink/brown).

Initial development — 2026-03-27 through 2026-04-05

First ten days went from empty repo to a fully functional browser-based modular synth. Highlights from that initial scope, before tagged releases began at 0.6.0:

Modules

• Audio: Oscillator (sine/square/saw/triangle + white noise, with pulse-width param and CV), Gain, Filter (lowpass/highpass/bandpass/notch), Delay, Mixer (2–16 channels with per-channel levels, labels, and dB markings), Ring Mod, Output.
• Control: LFO, Envelope (ADSR with linear and exponential curves), Beat (BPM clock with start/stop inputs), Random (trigger-driven and free-run), Quantizer, Sample & Hold, Step Sequencer (piano-roll editor with key/scale/octaves, loop, start/finished outputs), Clock Divider, Shift (trigger delay).
• Monitoring: Audio Scope (triggered capture with rising/falling/free-run trigger and clip indicator), Control Scope (fixed min/max range with clip indicator), Meter (VU with LED-style bars).

UI

• Full-window graph canvas with a floating logo watermark, auto-hiding icon toolbar, and slide-out drawers (patches, modules, collab).
• Dark theme; About dialog with version.
• Inspector with auto-generated controls per module, log scaling on appropriate parameters, reset-to-default, and bespoke editors (waveform, envelope curve, trigger, noise type, ADSR).
• In-node UIs for scopes, meters, mixer faders, sequencer piano roll, and early input controls.
• Graph editor with create/delete/connect/reconnect, drag-to-create from the module browser, port-type validation, and edge disable/enable.
• Transient scope on selected edges for ad-hoc inspection.
• Patch save/load with a patch browser and built-in sample patches (Smorgasbord, Ambient #1, Simple mini-synth).
• Mobile and touch support throughout — touch-aware toolbar, drag-to-create on touch, audio resumes on first interaction.