GS Music Bree6 Keyboard Polyphonic Analog Synthesizer Blue Mint Open-Box

With great dedication and commitment, it is an honor for us at GS Music to present the Bree6 Keyboard version, our first synthesizer with an integrated keyboard, designed and produced in Argentina for the world. This instrument represents a significant milestone in our journey as instrument makers and reflects our vision to create tools for musicians who value quality as a non-negotiable standard.

The Bree6 Keyboard is built to deliver an intuitive and expressive analog experience, combining a robust architecture with a carefully crafted user interface that invites exploration and creativity.

Built upon a six-voice analog architecture, the Bree6 Keyboard delivers a powerful and expressive sound engine, capable of producing a wide range of textures, from solid basses and articulate leads to rich, evolving pads. Its carefully designed signal path, combined with an intuitive interface and a high-quality keyboard with velocity and aftertouch sensitivity, provides a direct and immersive playing experience.

Expanding beyond the desktop version, the Bree6 Keyboard incorporates an advanced arpeggiator and a built-in sequencer, significantly enhancing its creative capabilities. The arpeggiator features multiple layers of operation, allowing for complex rhythmic patterns and evolving sequences, while the sequencer enables users to capture and develop musical ideas directly from the instrument, making the Bree6 Keyboard a complete performance and composition tool.

Every aspect of the instrument has been developed with careful attention to detail, combining a refined aesthetic with a robust and purposeful construction. The Bree6 Keyboard features an all-metal build complemented by natural cedar wood side panels, and is hand-assembled to ensure quality and consistency in every unit.

It incorporates a semi-weighted keybed with velocity and aftertouch sensitivity, along with pitch bend and modulation wheels engineered in-house to provide precise, reliable, and expressive control.

Immediate Control. No Menu Diving.
The Bree6 Keyboard version is designed to deliver an immediate and intuitive hands-on experience, eliminating the need for deep menu navigation. Its interface follows a one-knob-per-function philosophy, providing direct access to all key parameters for fast and precise sound shaping.

Expressive control is at the core of the instrument. Velocity can be assigned to modulate both the filter and amplifier response, allowing dynamic tonal variation based on playing intensity. The modulation wheel provides real-time control over LFO modulation depth, targeting the oscillator pitch and/or the filter cutoff for expressive performance.

The instrument features a semi-weighted keybed with velocity and aftertouch sensitivity, ensuring a responsive and musical playing experience. It also includes dedicated inputs for sustain and expression pedals, with the expression pedal offering configurable assignment and adjustable response range for flexible control.

In addition to its performance capabilities, the Bree6 Keyboard integrates essential connectivity options, including MIDI, USB, balanced stereo outputs, headphone output, and external control inputs, making it equally suited for both studio production and live environments.

SIGNAL PATH
The Bree6 Keyboard version features a refined signal path engineered to preserve the character and integrity of its analog sound while incorporating modern control flexibility.

The audio path is fully analog, beginning with a Voltage-Controlled Oscillator (VCO), followed by a sub oscillator and mixer stage, then passing through a 4-pole low-pass ladder Voltage-Controlled Filter (VCF), and finally into a Voltage-Controlled Amplifier (VCA).

Control signals are digitally generated and include one Low-Frequency Oscillator (LFO) and two ADSR envelope generators.

A stereo digital effects section is integrated into the architecture, combining delay and chorus, maintaining a fully analog dry signal while blending in high-quality digital processing for added depth and movement.

OSCILLATOR
The Bree6 Keyboard version features a single analog VCO per voice, complemented by a dedicated sub oscillator to enhance low-frequency content.

The oscillator provides two primary waveforms: sawtooth and pulse. The pulse waveform supports Pulse Width Modulation (PWM), which can be dynamically adjusted and modulated via the LFO to create evolving textures.

Pitch can be finely adjusted, and modulation sources can be applied to introduce vibrato and other expressive variations.

The sub oscillator generates a square wave one octave below the main oscillator, adding weight, depth, and richness to the overall sound.

FILTER
The Bree6 Keyboard version is equipped with a 4-pole ladder-type low-pass filter, designed to deliver smooth and musical frequency shaping.

The filter includes resonance control and supports multiple modulation sources, including Envelope Generator 1 (EG1) with velocity sensitivity, LFO modulation, and performance controls such as modulation wheel and aftertouch.

This flexible modulation system enables a wide range of tonal possibilities, from subtle shaping to more aggressive and resonant filtering.

CHORUS AND DELAY
The Bree6 Keyboard version includes a built-in stereo effects engine designed to enhance spatial depth while preserving the analog core of the sound.

The chorus effect creates a rich ensemble character by simulating multiple detuned voices through modulated delay lines, resulting in a wide and immersive stereo image.

The stereo delay offers adjustable timing and feedback, with a maximum delay time of up to 1 second, allowing for anything from tight rhythmic echoes to expansive ambient textures.

LFO
The Bree6 Keyboard version includes a versatile Low-Frequency Oscillator that acts as a central modulation source.

Selectable waveforms include triangle, ramp up, ramp down, square, and random (sample & hold). The LFO frequency ranges from 0.1 Hz to 100 Hz, enabling both slow evolving modulations and fast modulation effects.

It can be routed to multiple destinations, including oscillator pitch and PWM, filter cutoff, and amplifier level.

ENVELOPE GENERATORS
The Bree6 Keyboard version features two ADSR envelope generators, providing precise control over both tonal and amplitude dynamics.

EG1 is assigned to filter modulation, while EG2 controls the amplifier. Each envelope includes attack, decay, sustain, and release stages, allowing detailed shaping of the sound over time.

MIDI POLYPHONIC EXPRESSION
The Bree6 Keyboard version supports MIDI Polyphonic Expression (MPE), enabling advanced per-note control when used with compatible controllers.

This allows independent manipulation of parameters such as pitch, pressure, and timbre for each note, significantly expanding expressive capabilities and performance depth.

Polyphony: 6 voices
Oscillator: Single analog VCO per voice
Filter: 24 dB/oct low-pass ladder filter with resonance
Envelope Generators: 2 × ADSR
LFO: Triangle, ramp up, ramp down, square, sample & hold
Effects: Delay, Chorus (DSP: 32-bit, 48 kHz, DAC/ADC: 24-bit)
Presets: 512