GRP-A4 Analog Synthesizer

via this auction

"Italian made GRP A-4 Analog Synthesizer.
Main Features: (3) full-feature oscillators, plus (2) discrete LFO's. S&H, Noise, Mixers, (2) ADSR, 16-Step sequencer, A-440 generator, 12dB State variable filter and 24dB Low pass filters, portamento, Auto-pan, accepts external signals, Stereo Headphone TRS jack. CV/gates in and out. MIDI and USB in rear. Complex routing features:



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  • YouTube via vigasan. Be sure to see the GRP label for more.
    "Enrico Cosimi plays GRP Synthesizer A8 - Bologna Animalogica meeting 22/03/2009"

    Video Playlist:
    The Big Grp Synthesizer A8
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    Grp Synthesizer A8 - Sample and hold
    Grp Synthesizer A8 - On The Run
    Grp Synthesizer A8 - Percussion
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    "The structure of the analog synthesizer is the following:

    ·6 VCOs, temperature stabilized, with 3 FM sources (lin/exp) and 2 PWM sources.
    ·6 SUB VCO with -1 and -2 octave selector.
    ·2 RING MODULATORS
    ·1 NOISE GENERATOR (White, Pink, Low Freq).
    ·2 VCF Low Pass 24dB/Oct Transistor Ladder (Moog® style).
    ·2 VCF State Variable 12dB/Oct with four modes (Oberheim® style, but with auto oscillation).
    ·2 FIXED FILTER BANK 14 BAND (a la Moog® 914 module).
    ·8 VCAS (three on the main audio signal path, the others for modulation).
    ·3 AUDIO MIXERS.
    ·1 AUTO PAN.
    ·4 SIX STAGES ENVELOPE GENERATORS in DAHDSR configuration.
    ·3 FOUR STAGE ENVELOPE GENERATORS in ADSR configuration.
    ·2 VCLFO
    ·1 PERFORMANCE LFO amplitude modulatable by Aftertouch or ModWheel.
    ·1 Real SAMPLE & HOLD.
    ·1 Full function (and complex) 8x2/16x1 STEP SEQUENCER syncable with MIDI, Int Clock, Ext Clock or whatever.
    ·Separate PORTAMENTO TIME for Upper and Lower sections.
    ·A-440 Hz reference tone.
    ·1 Internal MIDI INTERFACE"




  • YouTube via MusicMiK. http://mik.k5000.org/"This is a little demonstration of my DIY synthesizer. Due to video length limits, just a very very small subset of the features is shown.The synthesizer provides 2 VCOs, 2 12dB state variable filters, ring modulator, noise and an extremely flexible routing system with 26 VCAs to get everything together. It consists of about 1300 parts and is

Treat Yourself :)

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