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Quasimidi Polymorph

4.5 (3)

1 Critic Review

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Page last updated Mar 31, 2026

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Description

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PolyMorph sequencer / synthesizer is a full featured and powerful virtually analog synthesizer that assumes an evolved form and purpose of its breakthrough hit predecessor - the RaveOLution 309! First the sounds: the PolyMorph is basically four synths loaded with synth and drum sounds geared towards electronica and other forms of synthesizer music. Individual ADSR's and filters per oscillator make for a totally tweakable and flexible synthesizer. The sequencer: 16 step, 8 variations, 4 parts or instruments. Parts and even notes can be muted or changed in real time to build and decompose your grooves or synth textures. There are also preset phrase patterns to play around with.

Aside from sounding quite nice, the PolyMorph is beefed up by a great set of effects. Add distortion, EQing, reverb, chorus, flange, etc. to each of the four parts independently! The controls, knobs and sequencer can all be controlled via MIDI for in-studio use, however the impressive multi-effects implementation alone is a major hint that the PolyMorph is a machine suited for live, DJ and on the fly music production. The PolyMorph is for those of you looking to create synth music from a stand-alone box that is not entirely focused on dance.

Videos

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RetroSound

QUASIMIDI POLYMORPH Synthesizer Sequencer (1999) factory demo sequences and track

RetroSound

Quasimidi Polymorph - meditative early morning sequence

Wine&Synths

Gravity collapse II | Quasimidi Polymorph

Mutant Manfred

Quasimidi Polymorph – a brief walkthrough – no talking (Deutsch)

aljen

Gravity collapse | Quasimidi Polymorph

Mutant Manfred

Quasimidi Polymorph - FREE Samplepack!!!

LFOstore

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 Polymorph.

Value and pricing

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Rare 90’s virtual analog synths like the Polymorph, used by icons like The Chemical Brothers, command high prices due to scarcity and historical significance.
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Comparisons

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Like the Fizmo and E-Mu Morpheus, the Polymorph's obscurity and unique sound capabilities make it appealing to collectors and enthusiasts.
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Use cases and applications

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The Polymorph's use by influential electronic artists enhances its desirability among fans seeking that signature sound.
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Software and compatibility

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A modern editor exists for similar vintage synths, highlighting ongoing interest and potential ease of use for classic models.
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Users are seeking a reliable software editor for the Polymorph on macOS, indicating a need for modern software integration for this vintage synth.
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Setup and maintenance

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Owners have noted that the Quasimidi Polymorph can experience issues with encoders sending random data, impacting patch stability and MIDI output.
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The Polymorph can operate with a universal 12V PSU without issues, despite original specs suggesting a specific 10.5V power supply.
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The original power supplies are unregulated, which means they might deliver over 12V when not under load, allowing for flexible PSU use.
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Other

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It’s noted that Radikal Technologies is seen as a modern continuation of Quasimidi, suggesting a path for those interested in similar instruments with updated support.
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Owners have successfully used Quasimidi PSUs interchangeably between models like the Sirius and Rave-o-lution 309, suggesting compatibility across the range.
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Critic Reviews

Quasimidi Polymorph

soundonsound.com

The Quasimidi Polymorph is a distinctive synthesizer that shines with its aggressive sounds and real-time control capabilities, making it a standout choice for dance and electro enthusiasts. Its multitimbral effects and ability to transmit real-time changes over MIDI are commendable, offering depth beyond first impressions. However, the Polymorph is limited by its 8-note polyphony and lacks reverb effects, which might be a drawback for some users. Its patch structure can be quirky, and the initial manual is less than intuitive. Despite these issues, it promises a unique sonic palette that sets it apart from typical synths, appealing to those seeking something unconventional.

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4.5 out of 5

Based on 0 Reviews and 3 Ratings

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