GRP Synthesizer A1 Open Box

Premium quality analogue synthesizer

CAP2: 46583.0
£475.00 £559.00
£395.83 ex VAT
in stock

Compact tabletop semi-modular analogue synthesiser based on GRP’s flagship A2 synthesiser.


This B-Stock unit comes in original packaging, as new.

A full warranty of one year will be issued with this purchase.

Condition: EXCELLENT


At a glance

  • Compact synth in well-known GRP-quality
  • One VCO-design with pulse width modulation
  • OSC waveforms sawtooth, square, triangle, sub-OSC and noise
  • 18dB ladder lowpass filter with distortion and key tracking
  • Two LFOs with six waveforms each with symmetry control of sawtooth and square as well as sample & hold with random waveform (LFO 1) and three-stage speed control
  • ADSR envelope for volume/VCA with three-stage speed control and "drone mode" (like on the Roland SH2 i.e.)
  • 12 patch points for VCO, LFOs, filter, pulse width, volume/VCA and envelope as well as External-In
  • USB-Port for MIDI-functionality

The GRP Synthesizer A1 is a compact tabletop semi-modular analogue synthesiser based on GRP’s flagship A2 synthesiser.

The GRP Synthesizer A1 includes a single oscillator with three waveshapes (triangle, Square and Saw) and pulse-width modulation controls and FM. Voice generations also include a Sub of the VCO1 and noise. 

It also features GRP’s signature 18dB per octave VCF that includes a distortion control for added grit. 

Two LFOs can be assigned to the VCO or VCF and include wave-shaping capabilities and a random mode. The VCA has three modes, Gate and Release, Hold and following the Envelope Generator

The MIDI interface section includes a Glide function and Bend amount. It also offers the means to key the velocity to the Filter EG.

These features already make the GRP A1 a mighty and stunning-sounding synthesiser. Still, the inclusion of patch points brings the possibilities on offer to a whole new level allowing creative patching on the synthesiser itself or as part of a comprehensive modular system. Speaking of which, the A1 can be mounted in any eurorack case to become a powerful voice section of your modular system.

Alternative Products