Modular synthesis on the web

The modular synthesizer is a type of synthesizer consisting of separate specialized modules. The modules are typically connected together with patch cords in different ways as needed to generate needed tones. Typical modules are oscillators (operate on frequency), filters (spectrum), amplifiers/gates (amplitude) and Envelope generators (dynamic control). The earliest commercial modular synthesizers were developed, in parallel, by R.A. Moog Co., and Buchla in 1963Hardware offerings range from complete systems in cases to kits for hobbyist DIY constructors. For more information read the introduction by Roland and How to build a modular synth.

Today modular synthesizers exists in both physical and virtual forms. Modular Music Synthesis On The Web article introduced me to an interesting web based instrument: Zupiter is a modular synthesizer that runs in your browser. Zupiter app is written entirely in JavaScript and makes use of both the web audio and web MIDI APIs. You can play notes using your computer keyboard (A to L keys), using a built in sequencer node, or you can connect an external MIDI keyboard or sequencer. You can make your own synth by combining building blocs graphically together or you can play with the provided examples. Besides synth parts there is an oscilloscope module that can show you waveform in real time.


Here is a video that introduces you to Zupiter:

After interesting introduction you can go directly to to start playing and experimenting.

Some interesting synth examples with Zupiter:

Interesting synth to play with and my adaptation of it

Acid synth at

Several sequencers in one project

DTMF synth


Here is a link to my earlier posting on other type of web based synths that you might also find interesting to look at.


  1. vex 3 says:

    The modular synthesizer you share is great. with many great features. Hopefully you will have more great posts.

  2. Tomi Engdahl says:

    Designed for easy re-programmability via CircuitPython, this 8HP Eurorack module is a flexible piece of open source hardware.

    Thea Flowers’ Winterbloom Sol Module Offers Eurorack Compatibility and CircuitPython Programmability

    Designed for easy re-programmability via CircuitPython, the 8HP Eurorack module is a flexible piece of open source hardware.

  3. Tomi Engdahl says:

    The KiloDrone Features a Thousand Individual Oscillators
    Sam Battle, of the LOOK MUM NO COMPUTER YouTube channel, built a synthesizer with 1,000 individual oscillators.

  4. Tomi Engdahl says:

    This Audio Mixer Is A Eurorack

    Music making and DJing have both become arts predominantly pursued in a computer, as the mighty USB interface has subsumed audio, MIDI, and even DJ turntable interface controllers. There was a time though when an indispensable part of any aspiring performer’s equipment would have been an analog mixer, a device for buffering and combining multiple analog audio signals into a single whole. A mixer is still a useful device though, and [Sam Kent] has produced a very nice one that takes the form of a set of Eurorack modules made from PCB material. There are two types of modules, the main channel module which you can think of as the master module, and a series of isolator modules that handle the individual inputs.


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