Prototype

A10 Synthesizer

DesktopAnalogDuophonic

The GRP A10 is a large-format analog studio synthesizer in the lineage of the A8, built around immediate panel access, deep routing, and performance control rather than menu-driven minimalism. Its architecture can behave as a massive four-VCO mono instrument or split into two independent upper/lower sections, with four VCOs, a sub oscillator, ring modulation, noise, external input processing, two VCF blocks, VCAs, envelopes, LFOs, sample and hold, and extensive assignable modulation.

GRP has also folded a serious analog effects section into the instrument: dual wavefolders, dual triple resonator filters, a one-second BBD stereo delay, dual phaser, and stereo spring reverb. The R24-derived step sequencer, MIDI arpeggiator, MIDI/USB input, CV/gate control, clocking options, and unusually broad front-panel I/O make the A10 feel closer to a self-contained analog studio than a conventional keyboardless synth. Manufacturing is planned for 2026, so it should remain a prototype/announced product until production status is confirmed.

Announced

2026

Status

Prototype

Product links

Official site

Synthesizer

Format

Desktop, Semi-Modular

Synthesis

Analog, Subtractive

Battery Powered

Voice

A/D

Analog

Polyphony

Duophonic

Oscillators

Oscillator Type

VCO (Voltage Controlled)

Voices

Filter

Lowpass, Highpass, Bandpass, Notch, Ladder, State Variable, Resonant, Diode

Envelopes

LFO

Effects

Wavefolder, dual triple resonator filter, BBD stereo delay, dual phaser, stereo spring reverb

Workflow

Arpeggiator

Yes

Sequencer

Yes

Mod Matrix

Yes

Memory

Expression

Aftertouch

Monophonic

Velocity

Yes

Additional

Four VCOs plus sub oscillator, noise, ring modulation, external input/envelope follower, R24-derived step sequencer, MIDI arpeggiator, 57+2 audio/CV/gate connections, and mono, dual, or split operation across upper/lower sections.

I/O

Audio In

External mono input plus external stereo effect processing inputs

Audio Out

Balanced main L/R outputs and upper/lower L/R stereo pairs

Headphone

Headphone output

MIDI

MIDI Type

USB, DIN (5-pin)

Ports

USB, CV/Gate, Clock In, Clock Out, Line In, Line Out, Headphone

Wi-Fi

Measurements

Dimensions

120 x 56 cm

Last updated May 9, 2026

Grp Synthesizer

grpsynthesizer.it

Rome, Italy

Grp Synthesizer was founded in 2009 in Rome by Paolo Groppioni, beginning with the development of the A8 analog synthesizer following earlier prototypes like the A3 and A6. The Italian company hand-assembles boutique analog synthesizers that blend advanced technology with craftsmanship, drawing from a tradition of electronic lutherie to ensure consistent sound quality and design across models including the A2, A4, and Eurorack modules. Its philosophy prioritizes client satisfaction through uncompromising materials and construction, as seen in flagship instruments like the upcoming A10 with integrated analog effects.

A10 Synthesizer

Product links

Specs