Keyboard-first grid
Space starts pattern playback, Ctrl+Space starts song playback, Enter toggles steps, and arrow modifiers edit pitch, velocity, length, loop length, pattern length, timing resolution, and grid window position.
Version 0.3.2 for Windows x64
OneSeq 0.3.2
A sequencer synth for building patterns at keyboard speed, then reaching for the mouse only where it makes musical sense: parameters, samples, presets, and the Fractal map.
The MSI installs to C:\Program Files\OneSeq. This early release is unsigned;
verify the SHA-256 checksum before installing.
Release Package
Recommended: OneSeq-0.3.2-windows-x64.msi. Use the ZIP when you need a portable folder or want to inspect the bundled runtime files first.
- Installer
- OneSeq-latest-windows-x64.msi
- Portable
- oneseq-latest-windows-x64.zip
- Checksums
- SHA256SUMS.txt
Latest uploaded demo
OneSeq 0.3.1 video, with 0.3.2 now available
The newest uploaded video shows the 0.3.1 cockpit and parameter-step workflow. OneSeq 0.3.2 is the current download; a dedicated 0.3.2 video will follow after it is recorded.
Watch the 0.3.1 demo on YouTube
MCP bridge demo: agent-assisted live session. Earlier demo: first public OneSeq cockpit video
Workflow
Fast where a sequencer should be fast
OneSeq treats the keyboard as the main instrument for editing. The mouse is still there for visual choices, sample browsing, parameter menus, and Fractal coordinates, but grid work does not depend on pointer gymnastics.
Hold-key overlays
Hold H for help, T for track operations, O for pattern operations, R or N for track/pattern randomization, and S/R plus number slots for parameter snapshots.
Mouse where it helps
Right-click parameter cards to lock, clear, or link LFO targets; use the instrument and sample pickers visually; use the Fractal MAP to fit note mappings, zoom the view, pan with a modifier-drag, and pick coordinates.
Sound and sequencing depth
More than a basic step grid
The current 0.3.2 build combines internal synthesis, Massfall material collision sounds, sample playback, MIDI utility tracks, polymeter-style loop lengths, song mode, effects, and modulation inside the same project state.
Engines
Drum/Noise, BASS, FM, Pluck, Sampler, MIDI utility, Massfall Material/Collision, and Fractal Hybrid tracks can live in the same pattern.
Fractal Hybrid
Mandelbrot, Burning Ship, Feather, and SFX map families drive orbit-audio tones with per-note sound slots, TRIG audition, and fit/zoom/pan MAP editing.
Locks and LFOs
Lock individual step parameters, clear locks by track or pattern scope, and route four global LFOs to tracks, FX, or LFO parameters.
MCP live bridge
Enable a token-protected MCP bridge from Config, choose the OS interfaces it listens on, write one session log per app run, and inspect the session Action Journal.
Song and projects
Create, duplicate, rename, and switch patterns, arrange them in the song grid, and jump between saved project slots from the launcher.
MIDI and external gear
Use OneSeq as the sequencing brain
MIDI output can be enabled from Config, pointed at an output port, and mapped per track. MIDI input adds monitor feedback, learnable bindings, and built-in controller profiles for turning hardware into OneSeq control surfaces.
See controller profiles
Track channels
Track number can map to MIDI channel 1-16, with per-track send on/off.
Timing model
Step resolution and Swing drive audio, UI timing fallback, project-switch quantize, export, and MIDI note duration.
Song priority
During song playback, MIDI follows the highest active pattern in the current song column.
Input profiles
Built-ins cover Generic 8-knob, Traktor F1 observed, Torso T-1, MiniLab 3, MPK Mini, Launchkey MK4, nanoKONTROL2, X-Touch Mini, and Launch Control XL.
MCP bridge
Optional live control for agent-assisted sessions
OneSeq 0.3.2 includes an opt-in MCP area in Config. The app creates a local bearer token, lets you choose exactly which OS interface addresses should listen, and can save a per-session MCP request log only after you choose the logs folder.
Off by default
The bridge starts only when you enable it, and requests require the generated token.
Interface picker
Keep loopback for same-OS clients or choose a private LAN address for WSL-to-Windows MCP clients.
Session logs
Logging is optional and writes one file per app session to the folder selected in Config.
Creative edits
MCP tools can inspect status, snapshot the session, move transport/selection, edit patterns, and export the current pattern.
Action Journal
Power-user sessions can inspect a bounded journal of local, MIDI, UI, and MCP actions for workflow review.
Adapter dependencies
The OneSeq app needs no Python. MCP clients use a small Python 3 stdio adapter with only standard-library modules; no pip packages are required.
Screenshots
Current OneSeq UI captures
Representative 0.3.2 views from the public Windows build path, including the Fractal instrument map.
