Quasimidi Sirius

The Sirius is a keyboard "groove-synth," featuring a subtractive hybrid-tone-generation synthesizer referred to as DTE ('Difficult To Explain') synthesis introduced in 1997 by Quasimidi.

The unit featured both real-time and step sequencers with pattern- and song-modes, capable of acting basic drum machine, groove-box, or sound-module.

The 16 buttons perform multiple duties, including: In addition to level and pan controls, each track could also be routed to 2 effects engines; 1 for reverb/delay, 1 for modulation delays (delay/chorus/flanger).

While sequencing tools and the (preset) sounds of the Sirius were tailored toward 90's techno- and dance-music sounds and workflow, and the models in production held some unresolved limitations and bugs (being the last model produced before the Quasimidi company folded), the synthesis architecture and user interface of the Sirius feature unique innovations (many of which not seen on more modern/successor synthesizers) that may contribute to its niche appeal.

The Sirius was featured on the December 18, 2020 episode of "Bad Gear", where host AudioPilz noted it's uniquely 1990's techno-centric sounds, design, and workflow.