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Click the empty space to create a new node

Share Your Creation

On this page you can instantly share the project you created with Zupiter. Please note that one of the main goals of Zupiter is to encourage others to play, edit and re-share modified versions of your creation. Hence, to share your work, you must agree to renounce any rights over this work and release it into the public domain. To proceed, simply log in or register, set a title for your project, and click the "Share" button to upload your project to the server and make it available to others online.

Title of your project:

I agree to release this work into the public domain and renounce any copyright claims over it.

Browse Shared Projects

On this page you can browse projects created by other users of Zupiter. You can share your own projects, or modified versions of existing projects, by going over to the Share tab.


FM by Kaïser Clicker Clicker
Inverted Convector V.1.5 by Niklaus V
Computing 2019-11-16 by ColonelForbin108
Aliens play violin and cello by johnlois
Vibezzz 2.2 : Tests with bass and chords by Loic68
Beat for big boys by Mudd
fuzzy by internetjay
Detuned Saw Synth With Sub Osc And Stereo Delay by volca02
Triple oscillator + delay + overdrive pedal by Max
Seals, Seagulls and a Polypad by ubersquid
Noise Machine / Ocean Sounds by slowtoaster

Latest Creations



Zupiter is a modular synthesizer that runs in your web browser, loosely inspired by Pure Data, Max/MSP, and other visual programming languages. Essentially, it's a tool that allows you to build your own synthesizer by creating new nodes (modules) and connecting them together. By connecting nodes with edges, you control how audio data and control signals flow from one node to another and how sound is generated.

For those who are new to synthesizers and sound synthesis, A Beginner's Guide to the Synth is a good introduction to the basic concepts involved. Please don't hesitate to ask any question, offer feedback and report bugs in the musictools subreddit.

The Basics

Node Types

Each node has input ports on the left, output ports on the right, and performs some operation internally. Nodes like Add and Mul will add and multiply two input signals together. Sine, Saw, Pulse and Noise are oscillators (signal sources). The AudioOut node takes a left and right signal and plays it back on your speakers.

Creating New Nodes

Clicking on empty space in the Edit tab will make a dialog menu pop up which allows you to select the kind of node you want to create. Once the node is created, you can drag it around by clicking on the node's name and holding the left mouse button as you move the mouse.

Connecting Nodes

Nodes can have input and output ports, represented by orange boxes. By convention, the input ports of a node are always on the left side, and the output ports are on the right. You can only connect output ports to input ports. One output can be connected to multiple inputs, but each in put can only be connected to one output. To make a connection, simply click on the first port to connect, and then on the second. A white line (edge) representing the connection will appear.

Moving Nodes

To move a node, click on the node's name and hold down the mouse button while moving the mouse.

Deleting Nodes

You can delete nodes by holding down the shift key while clicking on a node's name.

Removing Connections

To break connections, you can click on the input-side port associated with that connection. This will break the connection, and leave you holding a dangling wire which you can then reconnect to an input port on another node. You can also drop the dangling connection by clicking on an empty part of the canvas.

It's also possible to override existing connections. In Zupiter, output-side ports can be connected to multiple inputs, but input-side ports can can only be connected to one thing. When you try to connect an output port to an input port that already is connected to something, this will remove the previous connection on that input port and override it with the new connection you just made.

Editing Node Parameters

Double-clicking on a node's name will make a Node Parameters menu specific to this node pop up. This allows you to edit advanced parameters, such as the minimum and maximum value a knob can output, or the output range of a sine oscillator.


This section contains some simple example synth graphs which can serve as mini tutorials to help you get started.

Producing Sound

In order to produce a sound, we need to connect an audio signal source to an audio output. The simplest possible graph that you could make to do this involves connecting a Noise node directly to an AudioOut node. Try creating this simple graph, and then press the Play button in the top-right corner.

Playing Some Notes

The MidiIn node allows you to get pitch and gate inputs for notes played on a computer keyboard or MIDI input device. The pitch value is the frequency of the note played. The gate value is one when a key is held down, or zero otherwise.

This example graph uses the pitch value to directly control a sawtooth wave oscillator. The gate value is then multiplied by the oscillator's output, so that you only hear a sound when a note is playing.

Press the play button in the top-right corner, and then try pressing the A to L keys on your keyboard to produce sound. You can also shift one octave up or down with the Z and X keys. If you want to use a MIDI input device, you should connect this device to your computer before loading up Zupiter (or refresh the page).

Volume Knob

It's useful to be able to change the amplitude (intensity) of a signal. An easy way to do this is to multiply that signal by some number. In this example, we multiply the output of a noise source by some factor that is controlled by a knob. You can change the value that the knob produces by clicking on the knob, holding the mouse button down and moving your mouse up and down. Knobs, by default, produce values between 0 and 1. However, you can change the output range of a knob by double clicking on its name (where it says "Knob") and editing the node's parameters.

MIDI Support

Zupiter can receive input from MIDI keyboards, sequencers and other types of MIDI devices. The MidiIn note, by default, will connect to every MIDI device on your system and receive notes. You can also map virtual knobs in Zupiter to physical knobs on a MIDI device by double-clicking on the virtual knob and then wiggling the physical knob you want to map to. If input from your device is not detected, try refreshing the Zupiter page.

Most MIDI controllers should work with Zupiter out of the box, but if you are looking to purchase new equipment, I have personally tested the Novation Launch Control, which has multiple mappable knobs, the M-Audio KeyStation 88, and the Akai MPK Mini.


Please don't hesitate to ask any question, offer feedback and report bugs in the musictools subreddit. However, please note that at the moment, I do not own a tablet. I only have access to Mac and Linux PCs. As such, Zupiter is only tested on Chrome and Firefox on those two platforms. Support for tablets, Windows computers and other platforms is not guaranteed.

Zupiter - Online Modular Synthesizer and Synthesizer

Creating Zupiter

I wanted to build a music creation tool that is easy to use, accessible and free. Zupiter is a synthesizer and step-sequencer that runs in a browser, meaning you don't even need to download and install any software to use it. Its interface is designed to be minimalistic and simple, so as not to put off beginners. The sharing feature gives you the ability to instantly put your work online. My hope is that this will enable the sharing of creative ideas and encourage cooperation between people, producing a positive feedback loop.

The Author

My name is Maxime Chevalier-Boisvert. I was borned and raised in Montreal, Canada and am passionate about computers, technology and electronic music. You can reach me via twitter, my handle is @Love2Code.

Copyright © 2019 - Maxime Chevalier-Boisvert