GS Music e7 User manual

USER MANUAL

INDEX
Introduction...............................................................................................................................................................2
Safety instructions.................................................................................................................................................2
Inside the box..........................................................................................................................................................2
Setup and connections...................................................................................................................................2
Overview and features....................................................................................................................................3
Front panel................................................................................................................................................4
Raer panel.................................................................................................................................................5
Signal path................................................................................................................................................................6
Basic operation......................................................................................................................................................6
Components and Controls............................................................................................................................6
Oscillators (VCOs)..............................................................................................................................7
Mixer................................................................................................................................................................8
Filter (VCF)..................................................................................................................................................9
Amplifier (VCA).......................................................................................................................................10
Envelope Generators (EGs).........................................................................................................12
Low-frequency Oscillators (LFOs)..........................................................................................14
Chorus..........................................................................................................................................................15
Delay..............................................................................................................................................................16
Portamento / Polyphony modes................................................................................................16
Global configuration........................................................................................................................................17
Panel Mode..............................................................................................................................................................19
Preset Mode.............................................................................................................................................................19
Multitimbral Mode.................................................................................................................................................21
Control Voltage (CV) ......................................................................................................................................25
Specs..............................................................................................................................................................................26
Support.........................................................................................................................................................................27
Warranty.......................................................................................................................................................................27

CREDiTS AND ACKNOWLEDGMENTS
Ernesto Romeo (Klauss/La Siesta Del Fauno, musician-synthist-producer): sound design;
Tomas Rodriguez (Sound Engineer): sound design, user manual; Romina Fontana a.k.a
Romiko Tchan: user manual, woodworking, assembly, graphic design and sound design;
Elena Epuin: assembly, quality control, design; Guido Salaya: electronic, mechanical and
sound design, programming and verification.
Special thanks to:
Sean McKee (Emmy-nominated composer, multi-instrumentalist and producer),
Jordan Rudess, Pat Scandalis, Daniel Lamela. Thank you very much for trusting GS Music.
We hope you enjoy the beautiful e7. We feel great joy and excitement to have created
the e7 synthesizer, the first polyphonic and multitimbral analog synthesizer made in
Argentina. Elena Epuin Guido Salaya Buenos Aires, Argentina, 2022
Elena Epuin
Guido Salaya
Buenos Aires, Argentina, 2022

SETUP AND CONNECTIONS
INSIDE THE BOX
With our greatest gratitude, from GS Music we thank you and congratulate you
for purchasing our new e7 polyphonic synthesizer. This instrument is the result of
years of research and development dedicated to bring you the first polyphonic
analog synthesizer created in Argentina.
The e7 will give you the chance to explore endless sonic possibilities that will
hopefully inspire you to create and enjoy. You will also be able to store more than
600 presets and thus generate your own sound bank.
We imagine that you are excited to start experimenting with the sounds that the
e7 has to offer. We encourage you to take the time to read this manual and get
an in-depth understanding of what you can do with this synthesizer.
PLEASE READ BEFORE USING THIS PRODUCT
When using the e7, these basic precautions must be followed:
- Read the manual carefully before operating this product.
- Do not use the e7 near water or heat sources.
- Connect the e7 to the power supply included in the box or one with the
same specs.
- Unplug the equipment if it will not be used for an extended period of time.
- In the event of equipment failure, do not open the equipment or attempt
to repair it yourself. Contact GS Music Technical Service.
Inside the box you will find the following items:
- GS Music e7 polyphonic analog synthesizer
- A DC 12V 3A power supply
- A user’s manual
Beside from what is included in the box, you may need the following:
SAFETY INSTRUCTIONS
INTRODUCTION
2
We encourage you to read the entire manual in order to learn more about the instrument and for a
better understanding of what you can do with the e7.
Be careful when unpacking and transporting this instrument.
Be sure to save the box and all packing material in case you need to ship it for any reason.

- A MIDI cable (DIN-5)
- A MIDI controller or keyboard
- A USB cable to connect the unit to a computer (USB MIDI)
- A TS or TRS ¼'' audio cable and an amplifier or a pair of headphones.
Connect the power supply included in the box to the DC 12 V connector at the
back of the unit. This power supply will work properly as long as it is connected to
a voltage of 100 to 240 V AC, 50 to 60 Hz.
Connect the MIDI cable between the MIDI OUT port of your MIDI controller or
keyboard and the MIDI IN port of the e7. The e7 is set up to receive MIDI
messages on channel 1 by default. If you wish to use a computer to send MIDI
information to it, plug one end of a USB cable into the USB port at the rear panel
of the unit and the other into your computer. Additionally, you can control the
synthesizer via CV.
Finally, connect the e7 to an amplifier or mixer using a TS or TRS ¼'' cable or a
pair of headphones.
Basic connections.
The e7 is an analog subtractive synthesizer with up to seven voices of polyphony.
In addition, it offers the possibility of distributing the seven voices in four different
Parts, thus achieving a multitimbral synthesizer. All settings can be stored in more
than 600 presets.
OVERViEW AND FEATURES
3
USB
MiDi OUT
TO OTHER DEVICES
TO OTHER DEVICES
POWER SUPPLY AC 220
DC 12V
MiDi THRU
MiDi OUT
MiDi iN
USB
AUDiO OUTPUT

The audio generation as well as the signal path is 100% analog. This synthesizer
features two ultra-stable analog VCOs per voice, a white noise generator and
an external audio input. The control signals are digitally generated, including
three low-frequency oscillators (LFOs) and two ADSR-type envelope generators
(EGs) per voice. In addition, it incorporates an effects processor with Chorus and
Delay.
The e7 synthesizer allows you to intuitively access a wide variety of functions in a
limited number of knobs and buttons. In this way, we guarantee to give you the
greatest possible features in a small, lightweight and easy-to-use device.
OSCILLATORS (VCO)
MIXER
Two voltage-controlled oscillators (VCOs) that generate Triangular, Tri-Saw, and
Sawtooth waveforms. In turn, each one is linked to a variable pulse width
generator.
The mixer allows you to adjust each oscillator and its associated sub-oscillator
level. You can also mix the noise generator or the external audio input.
FILTER (VCF)
A low-pass voltage-controlled filter (VCF) with a 24 dB/Oct slope and resonance
control.
FRONT PANEL
AMPLIFIER (VCA)
The amplifier is the section that allows you to control the dynamics of the
amplitude of the resulting audio signal.
4

ENVELOPE GENERATORS (EGS)
EFFECTS
MAIN OUTPUT
REAR PANEL
Two ADSR-type envelope generators (EGs). EG1 is oriented to control the filter
cutoff frequency. The EG2 is oriented to control the amplifier. However, both EGs
can also modulate several other parameters simultaneously.
The e7 is capable of processing the audio generated with Chorus and Delay.
LOW-FREQUENCY OSCILLATORS (LFOS)
The e7 has three low-frequency oscillators (LFOs). These oscillators generate
periodic waveforms whose frequency is usually below the audible range. These are
useful when you want to periodically vary a parameter.
Balanced Mono or Stereo (L/MONO, R) with TRS ¼” connector.
HEADPHONE OUTPUT
Stereo headphone output with TRS ¼” connector.
EXTERNAL INPUT
CONTROL INPUTS
MIDI
External audio input with TS ¼” connector.
Control voltage (CV) inputs for controlling Pitch, Cutoff frequency and Gain.
DIN MIDI and USB MIDI input and output to communicate the e7 with external
devices.
5
OUTPUT
Master volume control.