MATRIXSYNTH: New GS Music Zeus Analog Polyphonic & Apollo Mini Desktop Synthesizers

Saturday, September 21, 2019

New GS Music Zeus Analog Polyphonic & Apollo Mini Desktop Synthesizers

Zeus analog polyphonic synthesizer demo Published on Sep 21, 2019 GS Music

"A short demo of the sounds that can be achieved with Zeus, the analog polyphonic synthesizer made by GS Music."

This one was spotted and sent in via Soviet Space Child.

New synths from GS Music who brought us the Apollo II desktop synth & the Stochastic Inspiration Generator eurorack module. Pics and (Google translated) details of the Apollo Mini follow via

No additional details on the Zeus are up as of this post. Update:details are in:

"Zeus is a multitimbral analog polyphonic synthesizer featuring substractive synthesis. The sound generation is entirely analog. Each voice has two voltage controlled oscillators (VCO), a mixer, a voltage controlled amplifier (VCA). The control signals on each voice are digitally generated by a microcontroller, which is capale of processing three low frequency oscillators (LFO) and two ADSR envelopes (EG). This synthesizer is still a prototype.

Zeus interface was designed to be intuitive with all the controls on the panel. It also features a graphic display to show the different parameters and curves. For example, it can show the envelope curves.


Keyboard: 49 keys, velocity sensitive with aftertouch
Polyphony: 12
Oscillators: 2 voltage-controlled analog oscillators (VCO) with sub-oscillators. Hard sync.
Oscillators waveshapes: Triangular, Saw-Tri, Sawtooth, Pulse with PWM. It is possible tomix pulse with other waveshape
Filter (VCF): 24dB/oct (4 poles) low pass filter with resonance control
Envelopes: 2* (Attack, Decay, Sustain, Release), Velocity to Attack
LFO: 3
LFO waveshapes: Triangular, Rampa up, Rampa down, Square, Sample and Hold
Effects: Chorus, Delay
Presets: TBD
Connections: MIDI IN, MIDI OUT, MIDI Thru, Audio Output (Plug 1/4” TRS balanceado), Sustain, USB, Filter CV, Amplifier CV, Audio input.
Power supply: AC 220V"


"The GS Apollo Mini is an analog subtractive synthesis synthesizer. The sound is generated in a totally analog way, with two voltage controlled oscillators (VCO), a mixer, a voltage controlled filter (VCF) and a voltage controlled amplifier (VCA). The control signals are digitally generated by a microcontroller, which is capable of processing two low frequency oscillators (LFO) and one envelope (EG) of the ADSR type.

The Gs Apollo Mini interface was designed to be simple and intuitive. It has 18 knobs and 3 buttons. It allows to generate a great variety of sounds.


Polyphony: Monophonic, priority to the last note

Oscillators: 2 voltage controlled analog oscillators (VCO) with sub oscillators.

Oscillator waveforms: Sawtooth, Pulse

Filter (VCF): Low pass filter of 24dB / Oct (4 poles) with resonance control.

Envelopes: 1 (Attack, Decay, Sustain, Release)

LFO: 2 *

LFO waveforms: Triangular, Ramp up, Ramp down, Square

Connections: MIDI IN, USB, Audio Output (Plug 1/4 "TRS balanced)

Power: DC 12V 1A

Dimensions: 215mm x 105mm x 57mm

Weight: 0.78 kg

Dimensions (with packaging): 280mm x 190mm x 95mm

Weight (with packaging): 1.2 kg

* Only one LFO is controllable from the panel. The corresponding MIDI CC must be used to access the other LFO. By default, the additional LFO is activated with the aftertouch or the modulation wheel."

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