A4
2012
The GRP A4 is GRP's 'Wild Analog Synthesizer,' a large monophonic/paraphonic analog instrument famously used live by Jean-Michel Jarre. It features three wide-range VCOs (64' to 2') with six waveforms, manual PW/PWM and hard sync, feeding a dual analog filter section: a 24 dB/oct transistor-ladder lowpass and a 12 dB/oct state-variable filter. It also integrates a built-in analog step sequencer, multiple envelopes and LFOs, and CV/Gate plus MIDI control.
History Coming Soon
We're compiling the full history of the GRP A4. Check back soon for production timeline, variants, notable users, and cultural significance.