Superbooth 22: Dreadbox Murmux Leak, 8-voice polyphonic analog Synthesizer

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Leak: at Superbooth 22, the Polish company GRAWART showed the front panel of the new Dreadbox Murmux polyphonic analog Synthesizer

Superbooth 22 is over, but there’s another Synthesizer leak. It even comes straight from a booth. The Polish front panel and housing manufacturer GRAWART displayed an interface of an upcoming Dreadbox Murmux poly Synthesizer.

The Murmux was initially a paraphonic Synthesizer with four rich-sounding oscillators, creamy analog filter… features and sound that a lot of people loved. According to the leak, Dreadbox is working on a poly version of the Murmux.

Dreadbox Murmux leak

Superbooth 22: Dreadbox Murmux

You can see everything on the Murmux front panel. Whether it is the final version is not known. But what can you say, it is very clear and hands-on.

Murmux will have two analog VCOs with multiple waveforms (saw, pulse, sine, noise…), a dedicated tuning knob for each oscillator, and a sync option. There is no “real” mixing section onboard but a knob that allows you to choose from different mixing preset settings (off, 1, 1+2, 1+2+N, 2+N, N). There are also detune, glide, and two modulation buses for modulating oscillator parameters either with the LFO or envelope.

Then, it has a filter with a big knob, resonance, a bass booster/dampener (cut), and built-in filter FM. It can be done via the noise generator or VCO 2 and there is filter tracking. To refine your sounds, it has a BBD section than can be a resonator or ensemble effect and a delay with mix, time, and feedback controls. There is also a master section with level control and stereo spread.

On the modulation side, it has two ADSR envelopes. Whether they are loopable or have other functions via the menu is not known. Further, it has polyphonic LFO with fade in/out functionality, rate control, wave knob, and spread. The latter gives you either a detune or tracking option.

LFO B is monophonic and has controls for the rate, positive/negative, and knobs for the mod target and wave. There is also a display with load, save, and back buttons. Thus, presets can be saved in the Murmux with great certainty.

Grawart Superbooth

First Impression

A very classic polyphonic analog Synthesizer with a good feature set. Filter FM and BBD-based resonator or ensemble as an effect is very interesting. So, you can create very unusual analog sounds as well as catchy string machine-style pads. I’m very excited about all the features and the first sound demos. Stay tuned.

The news is video

More information will follow here: Dreadbox

Superbooth 22 News

Hardware Synthesizer News


  1. Wonder if the Murmux comes instead of the Abyss V2 or if dreadbox rly plans two new 8 voice synths !?

  2. Disagree, love the colour scheme and looks actually professional and retro chic! Unless they ruin it, the first synth from them that does not look like it was made from the spare parts of a conversion van.

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