GS Music Bree6 Keyboard Black is a six-voice analog polyphonic synthesizer with an integrated keyboard — the first keyboard instrument from Argentinian manufacturer GS Music. All-metal chassis with natural cedar wood side panels, hand-assembled, and built around a strict one-knob-per-function layout. No hidden menus, no encoder banks to scroll through.
Fully Analog Signal Path, Top to Bottom
Each of the six voices runs a single analog VCO with sawtooth and pulse waveforms plus pulse-width modulation, backed by a square-wave sub-oscillator for low-end density. The signal then passes through a 4-pole ladder low-pass filter (24 dB/oct) with resonance, shaped by two independent ADSR generators — EG1 hardwired to filter cutoff, EG2 to the VCA. The LFO covers 0.1 Hz to 100 Hz across five waveforms (triangle, ramp up, ramp down, square, sample & hold), routable to pitch, PWM, filter cutoff, or amplifier level. Digital effects — stereo delay and chorus — run in a parallel processor and leave the VCO/VCF/VCA chain untouched.Performance Control Without the Guesswork
The 37-key semi-weighted keybed with velocity and aftertouch is complemented by in-house-engineered pitch bend and modulation wheels. Octave up/down switches extend the playable range on stage without patching. Dedicated sustain and expression pedal inputs — the expression pedal supports configurable assignment and adjustable response range. MPE (MIDI Polyphonic Expression) support enables per-note pitch, pressure, and slide control from any compatible controller. The multilayer arpeggiator handles double and triple note patterns for rhythmically complex output, while the built-in step sequencer lets you capture ideas directly on the instrument without reaching for a DAW.KEY FEATURES
- 6-voice polyphony with fully analog signal path
- Single analog VCO per voice: sawtooth, pulse, PWM + square sub-oscillator
- 4-pole 24 dB/oct ladder low-pass filter with resonance
- 2× ADSR: EG1 to filter, EG2 to VCA
- LFO 0.1–100 Hz, 5 waveforms, multi-destination routing
- Stereo voice panning
- Digital effects: Delay and Chorus
- 37-key semi-weighted keybed with velocity and aftertouch
- Pitch bend and modulation wheels
- MPE support
- Multilayer arpeggiator (double/triple note) and step sequencer
- Sustain and expression pedal inputs (configurable range)
- All-metal build with natural cedar wood side panels, hand-assembled
TECHNICAL SPECIFICATIONS
- Polyphony: 6 voices
- Oscillator: 1× analog VCO per voice
- Sub-oscillator: square wave per voice
- Filter: 4-pole ladder low-pass, 24 dB/oct, with resonance
- Envelopes: 2× ADSR (EG1 — filter, EG2 — VCA)
- LFO: triangle, ramp up, ramp down, square, sample & hold; 0.1–100 Hz
- Effects: Delay, Chorus (stereo digital processor)
- Keyboard: 37-key semi-weighted, velocity, aftertouch
- Expression controls: pitch bend wheel, modulation wheel, sustain pedal input, expression pedal input
- MIDI: MIDI IN/OUT, USB MIDI, MPE
- Audio outputs: balanced stereo output, headphone output
- Power: external power supply
- Build: aluminum enclosure with cedar wood side panels, hand-assembled
- Street price: approx. $1,699 USD