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GRP Synthesizer A1 Owner's Manual

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Grp A1 - Owner's Manual
Grp Synthesizer®
A1 - Owner's Manual
MIDI INTERFACE
MIDI TO CV
KEY VEL FEG
ACT
DISABLE
GLIDE
BEND AMT
0
10
0
LFO 1-S&H
RATE
MID
SLOW
0
10
LFO 2
RATE
MID
SLOW
0
10
1V/Oct IN
GATE IN
CV IN PWM CV IN FLT CV IN VCA
www.grpsynthesizers.it
www.grpsynthesizer.it
TUNE
8'
b
#
OCTAVE
PWM
10
0
10
FREQUENCY
RESONANCE
SHAPE
0
10
ATTACK
SHAPE
0
10
EXT IN
Grp Synthesizer
VCO
VCO LEVEL
4'
SQR
16'
SAW
0
WAVE
FM AMT
LFO 1
LFO 1
MAN
LFO 2
0
DIST
0
10
0
10
ENVELOPE GENERATOR
DECAY
SUSTAIN
0
10
0
10
VCO OUT
VCF OUT
EG OUT
A1
®
1
SUB LEVEL
NOISE LEVEL
10
0
10
0
MAIN OUT
VCA
GATE + REL
FILTER EG
10
0
18 dB VCF
TRK
FM
LFO 1
LFO 2
0
10
0
RELEASE
EG AMT
MID
SLOW
0
10
0
LFO 1 OUT
LFO 2 OUT PHONES
info@grpsynthesizer.it
10
10
10
10
MAIN OUT

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  • Page 1 Grp A1 - Owner’s Manual Grp Synthesizer® A1 - Owner’s Manual MIDI INTERFACE TUNE VCO LEVEL SUB LEVEL NOISE LEVEL MIDI TO CV KEY VEL FEG DISABLE OCTAVE WAVE GLIDE BEND AMT FM AMT MAIN OUT LFO 1 LFO 1...
  • Page 2 Grp A1 - Owner’s Manual This page was intentionally left blank www.grpsynthesizer.it...

  • Page 3: Table Of Contents

    Grp A1 - Owner’s Manual Contents Welcome 4.4.2.1. CV IN FLT Safety Rules 4.4.2.2. VCF OUT Connections 4.5. ENVELOPE GENERATOR 3.1. MIDI Data Received 4.5.1. ENVELOPE GENERATOR - Panel Controls 3.2. Choosing MIDI Channel 4.5.1.1. ATTACK The Grp A1 Synthesizer 4.5.1.2.

  • Page 4: Welcome

    The same could happen with the USB ports of poorly energy-equipped laptops. If necessary, it is recommended to use a powered USB hub, using it between the laptop and the Grp A1 Synthesizer. Under no circumstances should Grp Synthesizer be held responsible for any malfunctions.

  • Page 5: Safety Rules

    The same could happen with the USB ports of poorly energy-equipped laptops. If necessary, it is recommended to use a powered USB hub, using it between the laptop and the Grp A1 Synthesizer. Under no circumstances should Grp Synthesizer be held responsible for any malfunctions.
  • Page 6 Grp A1 peripheral and can execute Note On/Off & Pitch Bend commands sent by your DAW on the instrument's MIDI Channel (see below). If necessary, use the MIDI IN port to drive the Grp A1 with a MIDI Master Keyboard or other external controller equipped with MIDI 5-pin DIN.

  • Page 7: Midi Data Received

    MIDI data and then turns off waiting for the normal codes received. Now, the Grp A1 is tuned to the desired MIDI channel and can be used normally. • Power on with MIDI TO CV switch in ENABLE position. If the instrument is turned on with the switch in the ENABLE (upward) position, the machine remains set to the previously selected MIDI Channel.
  • Page 8 Grp A1 - Owner’s Manual 4. Grp A1 Synthesizer The Grp A1 monophonic synthesizer can be used as a stand-alone musical instrument or can be used to filter external signals within the Low Pass 18dB VCF resonant circuit. The three internal audio sources (VCO, SUB and NOISE) guarantees timbre power and ease of use.

  • Page 9: Midi Interface

    Grp A1 - Owner’s Manual 4.1 MIDI INTERFACE The MIDI INTERFACE section manages the reception and interpretation of MIDI codes that reach the A1 synthesizer indifferently on the DIN MIDI IN or USB connector on the rear panel. 4.1.1. MIDI TO CV...

  • Page 10: Vco

    Grp A1 - Owner’s Manual 4.2. VCO The VCO (Voltage Controlled Oscillator) is the main sound source of the synthesizer; It produces different waveforms (with a different harmonic content) and can be tuned to the desired frequency. It is possible to modulate the symmetry of the square wave and the pitch of the oscillator.

  • Page 11: Lfo1 / Eg / Lfo2

    Grp A1 - Owner’s Manual 4.2.1.6. LFO1 / EG / LFO2 The switch chooses the modulation source that is applied to the pitch of the oscillator into range set through FM AMOUNT control. With the three switch positions, you can choose: LFO 1 (the modulating signal produced by LFO 1 - and internal S&H), EG (the ADSR Envelope Generator), LFO 2 (the modulating...

  • Page 12: Mixer

    Grp A1 - Owner’s Manual 4.3. MIXER The MIXER receives and balances the three signals simultaneously available in the A1 synthesizer. 4.3.1. MIXER - Panel Controls MIDI INTERFACE TUNE VCO LEVEL SUB LEVEL NOISE LEVEL MIDI TO CV KEY VEL FEG Below, the description of the MIXER panel commands.

  • Page 13: Db Vcf

    Grp A1 - Owner’s Manual MIDI INTERFACE 4.4. 18dB VCF TUNE VCO LEVEL SUB LEVEL NOISE LEVEL MIDI TO CV KEY VEL FEG The 18dB VCF - Voltage Controlled Filter allows you to sculpt in real time the harmonic content of the sound generated by the synthesizer.

  • Page 14: Trk

    4.4.2.2. VCF OUT Is the audio output of the 18 dB VCF module. In this way, it is possible to use Grp A1 as a sophisticated processor for static or dynamic audio processing through modulation.

  • Page 15: Envelope Generator - Panel Controls

    MIDI INTERFACE TUNE VCO LEVEL SUB LEVEL NOISE LEVEL Grp A1 - Owner’s Manual MIDI TO CV KEY VEL FEG 4.5. ENVELOPE GENERATOR DISABLE OCTAVE WAVE GLIDE BEND AMT FM AMT MAIN OUT LFO 1 LFO 1 GATE + REL The Envelope Generator produces the transient control signal necessary for the articulation of the filtering over time.

  • Page 16: Envelope Generator - Control Connections

    Grp A1 - Owner’s Manual 4.5.2. ENVELOPE GENERATOR - Control Connections Below, the description of the control connections of the ADSR Envelope Generator present on the synthesizer control panel. 4.5.2.1. GATE IN The connection accepts the analog voltage 0/+5V necessary to trigger the Envelope Generator.

  • Page 17: Vca

    Grp A1 - Owner’s Manual 4.6. VCA - Voltage Controlled Amplifier The Voltage Controlled Amplifier allows you to control the volume of the signal produced by the A1 MIDI INTERFACE TUNE VCO LEVEL SUB LEVEL NOISE LEVEL synthesizer over time. You can choose three different control sources with the FILTER EG / HOLD / GATE + REL switch;...

  • Page 18: Lfo 1 - S&H

    Grp A1 - Owner’s Manual MIDI INTERFACE TUNE 4.7. LFO 1 - S&H MIDI TO CV KEY VEL FEG The module includes a cyclic modulation source LFO 1 - Low Frequency Oscillator and a Sample & Hold, DISABLE which produces random control voltages. As in higher-end GRP instruments, it is possible to adjust the...

  • Page 19: Lfo 1 - S&H - Control Connections

    Grp A1 - Owner’s Manual 4.7.2. LFO 1 - S&H - Control Connections Di seguito, la descrizione delle connessioni di controllo relative al modulo LFO 1 - S&H presenti sul pannello comandi dello strumento. 4.7.2.1. LFO 1 OUT Below is a description of the control connections related to the LFO 1 - S&H module on the instrument control panel.

  • Page 20: Lfo

    DISABLE GLIDE BEND AMT Grp A1 - Owner’s Manual 4.8. LFO 2 LFO 1-S&H RATE FREQUENCY SHAPE The module produces a cyclic control voltage adjustable between triangular and pulse with different SHAPE symmetry values. Also in this case, the signal LED makes the selected frequency visible.

  • Page 21: Front Panel Connections

    LFO 2 FILTER EG LFO 1-S&H 18 dB VCF RATE FREQUENCY RESONANCE DIST Grp A1 - Owner’s Manual LFO 1 SHAPE SLOW LFO 2 5. FRONT PANEL CONNECTIONS ENVELOPE GENERATOR LFO 2 RATE ATTACK DECAY SUSTAIN RELEASE EG AMT For the reader’s convenience we bring together the descriptions of all the Input/Output connections SHAPE present in the lower end of the front panel.

  • Page 22: Outputs

    10V p-p. • VCF OUT. It is the audio output of the 18 dB VCF module. In this way, it is possible to use Grp A1 as a sophisticated processor for static or dynamic audio processing through modulation.

  • Page 23: Rear Panel Connections

    The same could happen with the USB ports of poorly energy-equipped laptops. If necessary, it is recommended to use a powered USB hub, using it between the laptop and the Grp A1 Synthesizer. Under no circumstances should Grp Synthesizer be held responsible for any malfunctions •...
  • Page 24 Grp A1 - Owner’s Manual Manual: Enrico Cosimi Grp Synthesizer S.r.L. Via Formello, 17 Monte Porzio Catone 00078 (RM) Italia www.grpsynthesizer.it info@grpsynthesizer.it www.grpsynthesizer.it...

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