CB Quadrivium
Four-voice polyrhythmic sequencer
35 browser tools for MIDI hardware, sampling and DecentSampler instruments. Free. No install. No account.
Four-voice polyrhythmic sequencer
Modular step sequencing workbench
Cellular automata note generator
Flow-field modulation source
Layered sediment pattern generator
Pendulum curves as CC and note streams
Physics-driven note triggering
Slime-mould agent sequencer
Retro-Gameplay as rhythm engine
Vector-drawn modulation paths
Generative ambient texture engine
16-pad sample player with MIDI out
Dual-oscillator synthesizer in the browser
Delay, tempo, tuning and sample-rate maths
Build your own MIDI control surfaces
Synthetic impulse responses: rooms, plates, springs
Capture IRs from your own hardware — sine-sweep deconvolution with harmonic separation
Plan and document sampling sessions
Verify every control on a MIDI controller
Live MIDI message inspector
Send, receive and archive SysEx dumps
Build Decent Sampler Instruments without Coding
Turn a sample folder into a mapped preset
Inspect a preset's mapping and find gaps
Compare two presets and report what changed
Generate knob and slider filmstrips as PNG
Lay out preset panels and export the XML
Audit sample rate, bit depth and loudness in batches
Sample and build DecentSampler instruments in your browser
Batch WAV conversion for hardware samplers
EVERYTHING RUNS LOCALLY · NO SAMPLE IS EVER UPLOADED
Rather play than build? Ready-made DecentSampler instruments → sounds.cbsound.de
Full operator's manuals for the tools and the instruments, panel by panel. Written for people who want to know what every control does, not just where to click.
Yes. Tools that work with audio, like Auto Mapper, Drumpad 16 or Sample Harvester, load your files straight into the browser. Nothing is uploaded, and all processing happens on your machine.
The only files that leave a tool are the ones you export, and those are saved to your own computer.
Yes. Every tool on this page is free to use, with no account, no licence key and no trial period.
There is a paid supporter pack, but nothing on this page is cut down to sell it — these are the full versions. The pack adds offline copies of everything, 25 impulse responses, extra Fossil datasets, and three tools that ship only there: Macro Lab Plus, Drum Engine and Sample Forge.
Not from this page — it needs to load. Offline copies are in the supporter pack on itch.io: unzip it and the tools run from your own drive, with no internet and no dependency on this site staying up.
No. Each tool is a single self-contained file — unzip the pack, open the tool in your browser and it runs. MIDI works straight from the folder too, so there is nothing to install and no command line involved.
A current desktop browser, nothing to install. Chrome, Edge and Brave run every tool. Firefox runs the MIDI tools too, after a one-time permission prompt. Safari has no MIDI support, so use it only for the audio and calculator tools.
A browser with MIDI support (see above) and something to talk to: a synth or controller with USB MIDI, a MIDI interface, or your DAW through a virtual MIDI port. The first time a tool asks for MIDI access, allow it in the browser prompt.
No. The sequencers send MIDI notes and controller data. Route that to a hardware synth or a software instrument in your DAW to hear it.
The synths are the exception — Paper Nest and Ambient Engine make sound themselves.
Generate patterns for hardware synths or DAW tracks, watch incoming MIDI message by message (MIDI Monitor), store and resend SysEx patch dumps (SysEx Librarian), build your own control surface (Control Forge), or check that every knob and key on a controller sends what it should (Controller Test Bench).
Hardware synths: connect them by USB or through a MIDI interface. Once you allow MIDI access, the browser lists them as MIDI outputs.
Your DAW: you need a virtual MIDI port between the browser and the DAW. On macOS, enable the built-in IAC Driver in Audio MIDI Setup. On Windows, install a free virtual port such as loopMIDI. Then pick that port as the output in the tool and as the MIDI input in your DAW.
The tools are designed for desktop screens. iPhone and iPad browsers have no MIDI support, so the MIDI tools won't work there.
Almost everything here is free and stays that way — no accounts, no trial timers, nothing switched off after a week. Three tools live in the supporter pack instead. That’s what keeps the rest of the tools free.
A full synth playground in the browser — all 20 modulation algorithms, with MIDI out.
Eight synthesis voices across four engines — analog, noise, FM and modal — plus a sample layer for your own WAVs. Played from the keyboard or MIDI hardware.
Auto Mapper and UI Editor combined into one preset builder — map the samples and design the panel in a single pass, instead of moving a folder between two tools.
25 impulse responses sampled from hardware units in my own studio: halls, plates, gated and modulated spaces, tape delays. Drop them into any convolution reverb in your DAW.
10 additional CSV datasets beyond the ones bundled with the browser version — more material to drive patterns from.
I am a sound designer in Munich. Many of these tools started as scripts for my own work — sampling hardware synths, mapping libraries, talking to the gear on my desk — and moved into the browser so I could share them. Others, like the sequencers, were built for this site.
Everything runs in the browser, on your machine, next to the hardware on your desk.
