A JavaScript emulator of the Synthi A synthesizer

In plain words

SYNTHI-JS is a JavaScript-based emulation of the EMS Synthi A analog synthesizer. It recreates the modular synthesizer experience with 11 components including oscillators and filters, organized around a central patchboard for routing connections between outputs and inputs. Users can hear synthesized output through designated output channels or visualize waveforms on a scope. The emulator adds features beyond the original 1970s hardware, making it accessible to musicians and synthesizer enthusiasts through a web browser.

written from the facts on this page · September 2026

From the sources

SYNTHI-JS is a JavaScript emulation of the legendary EMS Synthi A analog synthesizer. SYNTHI-JS is a modular synthesizer that is made up of 11 components: oscillators, filters and so on. The patchboard at the center is used to connect component outputs (listed on the left of the patchboard) to component inputs (listed on the top). To hear the output of any component, connect it to one of the Output Ch pins ( B and C ). You can also visualize the output of any component by connecting it to the Scope pin ( A ). SYNTHI-JS adds a couple features that were not in the original Synthi A: a Memory Bank that can store up to 100 different patches/configurations and export them as text files, and an…from alexnisnevich.github.io

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