The ER-99 inline drum machine is based on the infamous Roland TR-909


Matthew Cieplak, electronics and software engineer, has created a browser-based drum machine based on the original Roland TR-909.

The online drum machine is fully operational and does a very good job of emulating the classic drum synthesizer.

Named ER-99, the online instrument is ready to use – courtesy of Cieplak’s Extralife Instruments web page – and the instrument has a wide range of features. Cieplak has several hardware and software projects, but this is their first drum machine designed for the web.

You can use the browser-based ER-99 drum machine by pressing the number keys on your computer keyboard. “Turn the knobs to change the sound of each instrument,” reads the description of the ER-99.

“The 16 buttons at the bottom display the sequence for each instrument. Click once to activate a stage and click again to add an accent (indicated by a brighter light). The emphasis of accented notes is controlled by the ‘Accent’ knob,” he adds.

You can also create 64-step sequences with the “BARS” button in the center of the interface. “You can store sequences and sound presets using the menus above,” the ER-99’s description continues. “These are stored in your browser’s memory and will be recalled on your next visit (to this computer).”

While the ER-99’s drum sounds are synthesized with the WebAudio API, everything else is actually sample-based. Cieplak also notes that WebMIDI adds about “70 to 100 milliseconds” of latency when receiving note trigger information.

mixmag reports that some of Cieplak’s previous creations include a 6-channel ‘Hex Drum’ trigger sequencer, a Eurorack analog guitar synthesizer patch “loosely based on the Moog Moogerfooger MF-107”, and Super Sixteen, an open source hardware sequencer for the Eurorack synthesizer format.

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