Photo of Quasimidi Sirius and more gear in a studio and synths

Quasimidi Sirius

4.0 (5)

1 Critic Review

1 Review

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4 community setups

4 wishlisted

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Page last updated Mar 31, 2026

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Description

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Step into the world of sound design with the Quasimidi Sirius, a powerhouse synthesizer that merges classic analog warmth with modern digital precision. This synthesizer is favored by electronic musicians and producers for its distinctive onboard sequencer and robust sound architecture. The Sirius is designed to be as intuitive as it is versatile, featuring a 49-key velocity-sensitive keyboard that ensures expressive playability across any genre.

At its core, the Sirius boasts a hybrid sound engine combining subtractive synthesis with sample-based elements, allowing for a vast array of sonic possibilities. Equipped with 7 onboard effects, including delay and reverb, it offers ample room for creativity and experimentation. The real-time control knobs allow for seamless tweaks and adjustments, granting you the ability to craft and modify sounds on the fly. Additionally, the Sirius includes a built-in vocoder, empowering users to add that iconic robotic voice effect to their tracks effortlessly.

Whether you're in the studio or on stage, the Quasimidi Sirius stands out as a reliable and creative partner, offering a comprehensive suite of features tailored to meet the needs of today's musicians.

Key Features:

49-key velocity-sensitive keyboard
Hybrid sound engine: subtractive synthesis with sample-based elements
Onboard sequencer for intricate sound design
7 integrated effects including delay and reverb
Built-in vocoder for distinctive vocal effects
Real-time control knobs for dynamic sound manipulation
MIDI compatibility for seamless integration with other gear

Videos

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Jexus (sounds-for-synths.com)

Quasimidi Sirius | demo by Jexus / WC Olo Garb (part 1 of 2)

Jexus (sounds-for-synths.com)

Bad Gear - Quasimidi Sirius - 90s Techno Machine???

AudioPilz

Quasimidi Sirius Demo

Perfect Circuit

Quasimidi Sirius By Elektragen

Elektragen

QUASIMIDI SIRIUS (1997) synthesizer dance music workstation demo cd from the 90s

RetroSound

Quasimidi Sirius - Ultimate Ambient Machine?

LFOstore

Quasimidi Sirius demo CD [1998]

baward

Quasimidi Sirius - Waveform Deep Dive - Episode 1

Electronisounds Audio

Quasimidi Sirius - Why So Sirius?

The Free Radikal

Reviews

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Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Quasimidi Sirius.

Features and functionality

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The Sirius uses low-bitrate PCM samples for its audio source, giving it a distinct mid-90s sound with limited sculpting flexibility compared to oscillator-based synths.
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It is multitimbral, offering separate synth-voice and drum channels, and is easy to control over MIDI, enhancing its versatility in complex setups.
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Build quality

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The construction includes a metal chassis but is noted to be plasticky elsewhere, which may affect durability in accidents.
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Value and pricing

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In the US, prices for a Sirius in excellent condition range from $800-1000, with European prices potentially 200 euros less.
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Setup and maintenance

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Finding a Sirius with the correct power supply is crucial due to its rarity and potential compatibility issues.
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The Sirius can operate on a 12V power supply without issues, offering a solution for those unable to find the original 10.5V PSU.
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Software and compatibility

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Both the Sirius and Rave-o-lution 309 utilize the same power supply interchangeably, accommodating live setups with limited gear.
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Other

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The power supplies for Sirius are unregulated, potentially producing over 12V off load, suggesting flexibility in power input tolerances.
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Critic Reviews

Quasimidi Sirius

soundonsound.com

Quasimidi's Sirius is a standout in the dance workstation market, offering a robust package with three polyphonic synths, a vocoder, and a 7-track sequencer. Its intuitive interface and hands-on design make it a joy for live performance and studio use. The Sirius excels in delivering the gritty, electronic sounds coveted by dance music producers, although its preset library may feel repetitive. Limitations like a fixed 4/4 sequencer and basic effects are offset by features like the randomize function and vocoder with a gooseneck mic. While the beat recognition system could be more reliable, the Sirius remains an attractive option for electronic musicians seeking a versatile, performance-ready instrument.

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4.0 out of 5

Based on 1 Review and 5 Ratings

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patrick_richardson

833

almost 8 years ago

amazingly flexible quick-and-dirty sound design tool outpaces it's dated heritage

This device was made as a "band in a box" for techno music, a product of the late 1990's "groove synth" craze. All the presets are hilariously dated, but the ROM waveset and simple subtractive synthesis architecture is flexible enough to remain mid-fi fun for keys, drums, vocoding, and more WELL beyond it's rave-y roots.

For more information on tech and features, read my WikiPedia article HERE: https://en.wikipedia.org/wiki/Quasimidi_Sirius

Roles:

Drummer Music Producer Audio Engineer

Genres:

Electronic Rock Progressive rock

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