Grp Synthesizer - A4
€5,555.00
Net: €4,668.07
In stock
The A4 by GRP Synthesizer is a fully analog, monophonic high-end synthesizer that combines classic subtractive synthesis with exceptional build quality and a highly direct control layout.
At its core are three discrete VCOs with extensive modulation capabilities, a powerful dual-filter section, and an integrated analog step sequencer. A defining characteristic of the A4 is its clearly structured front panel with dedicated controls and rotary switches for selecting modulation sources. This approach allows complex routings to be configured quickly and intuitively — without patch cables, yet with a flexibility reminiscent of modular systems. The signal flow follows the classic architecture oscillator → mixer → filter → VCA and remains transparent at all times.
The instrument is housed in an elegant wooden enclosure; all potentiometers, switches, and jacks are of outstanding quality and designed for professional studio and live performance use. Sonically, the A4 covers a wide range — from punchy basses and precise sequenced patterns to richly modulated leads and experimental textures. The integrated analog sequencer adds a strong performative dimension, offering immediate access to pattern variations and rhythmic manipulation.
Features:
- Three VCOs, each offering six waveforms
– Exponential and linear FM
– Hard sync
– Sub-oscillator (for VCO 1 and 2) - Ring modulator
- Noise generator with white and pink noise
- Sample & Hold
- External audio input with envelope follower
- Audio mixer for VCO 1–3, sub-oscillator, noise, ring modulator, and external input
- Dual filter section with overdrive
– Multimode State Variable Filter (SVF)
– Low-pass filter with variable slope - Stereo output with auto-pan function
- Three envelope generators (AHDSR / ADSR) with loop function
- Two LFOs covering a wide frequency range (from very slow up to approx. 2.5 kHz) with multiple waveforms
- Analog step sequencer
– 2 × 8 or 1 × 16 steps
– Multiple playback modes
– Ratcheting
– Clock divider - Extensive MIDI implementation