Cwejman S1 MK2 User manual

S1 MK2 User’s Manual
(Guide/Handbook)

Table of contents page
Certification.............................................................................................. 1
Warranty and Assistance........................................................................ 1
Limitation of warranty............................................................................. 1
Before using this Synthesizer................................................................ 2
Checking Accessories....................................................................... 2
Environmental Conditions................................................................. 2
Safety Symbols..................................................................................
3
Grounding Requirements.................................................................. 3
Rack Installation................................................................................ 3
Installation of Instrument Stand (optional)......................................... 3
Repackaging for Shipment................................................................ 3
Introduction.............................................................................................. 4
Master Controller............................................................................... 6
Oscillators.......................................................................................... 9
Oscillators CV.................................................................................... 10
Mixer.................................................................................................. 11
Ring Modulator.................................................................................. 12
Noise Generator Outputs and Oscillators Outputs............................ 12
LFO.................................................................................................... 13
Low Pass Filter, Audio Input Mixer.................................................... 14
Multi Mode, Audio Input Mixer........................................................... 14
Low Pass Filter.................................................................................... 15
Multi Mode Filter................................................................................ 18
Envelope Generators......................................................................... 20
Rear Panel......................................................................................... 23
Calibration................................................................................................. 24
Oscillator scale................................................................................... 24
Master scale & Analog CV................................................................. 25
MIDI............................................................................................................ 26
Startup............................................................................................... 26
CV1 and Gate1/Trigg1....................................................................... 26
Gate2/Trigg2...................................................................................... 27
CV2.................................................................................................... 28
CV3.................................................................................................... 28
CV4.................................................................................................... 28
CV5.................................................................................................... 28
CV6.................................................................................................... 28
How MIDI Messages are Handled..................................................... 29
Program Change............................................................................... 29
Hold Pedal, Legato Pedal.................................................................. 29
All Notes-Off Message....................................................................... 29
All Sound-Off Message...................................................................... 29
Reset All Controllers Message........................................................... 29
Omni On/Off Messages...................................................................... 29
Warm up time.................................................................................... 3
Connections............................................................................................. 4
Getting started.......................................................................................... 5
Patchbay........................................................................................... 6
Master Amplifier................................................................................. 21
Oscillator range................................................................................. 25
Filters................................................................................................. 15

Reset Message Received................................................................. 29
CV Gate/Trigg Configuration............................................................. 29
Setting for CV Outputs...................................................................... 30
Setting Parameters........................................................................... 30
Routing the CV Outputs.................................................................... 31
Parameter Values, Table 1............................................................... 32
Upgrading Software.......................................................................... 33
Possible Routing of CV Outputs....................................................... 33
MIDI Implementation Chart...............................................................
Inside the Synthesizer.............................................................................
Oscillators......................................................................................... 34
Sine Waveform.................................................................................. 34
Triangle Waveform............................................................................ 35
Sawtooth Waveform.......................................................................... 35
Pulse Waveform................................................................................ 36
Triangle + Pulse Waveform............................................................... 37
Sync, Frequency and Amplitude Modulation..................................... 37
Noise generator................................................................................. 39
Ring Modulator.................................................................................. 39
Low Pass Filter................................................................................... 40
Multi Mode Filter................................................................................
Master Amplifier................................................................................. 45
Envelope Generators......................................................................... 46
33
34
44
Overdrive........................................................................................... 48
LFO.................................................................................................... 47

CERTIFICATION
Cwejman certifies that this instrument was thoroughly tested and inspected and found to
meet its published specifications when it was shipped from the factory.
WARRANTY AND ASSISTANCE
All Cwejman products are warranted against defects in materials and workmanship.
This warranty applies for 1 years from the date of delivery. We will repair or replace products,
which prove to be defective during the warranty period provided they are returned to Cwejman.
LIMITATION OF WARRANTY
The foregoing warranty shall not apply to defects resulting from improper or inadequate
maintenance by buyer, unauthorized modification or misuse, accident or abnormal conditions of
operations. No other warranty is expressed or implied. Cwejman specifically disclaims the
implied warranties of merchantability and fitness for a particular purpose. Cwejman shall not
be liable for any special incidental or consequential damages, whether in contract, tort or otherwise.
Copyright 2005 by Cwejman . Printed in Sweden. All rights reserved.
No part of this manual may be reproduced in any form without written permission of Cwejman .
1

Before Using this Synthesizer
Checking Accessories
Upon receipt of this instrument, run the checks shown below:
Run visual checks against any and all damages or imperfections.
Check the quantity and rating of standard accessories to assure their conformance with
the table below.
Should there be any flaw, or damage, or missing or insufficient materials,
contact the dealer or the sales and support office.
Power cable
1
Interconnection cables, 3.5mm
6
Rack holders
2
Rack Holder screws, M5
4
The Instruction manual
1
Environmental Conditions
Do not expose this unit to direct sunlight, corrosive gas, dust or vibration. The ambient temperature
must be +15 to +30
°C and the relative humidity must not be greater than 85%. The storage
temperature of this unit is 0 to +50
°C.
This unit is designed with the affect of AC power supply line noise taken into consideration. However,
it is recommended that it be used in a place where there is minimum noise. If noise is unavoidable,
use a noise suppresser or the equivalent.
CAUTION! Before turning this unit on, check the supply voltage switch on the Rear Panel
for proper position.
Voltage selector in 115Vac position.
2
115

Safety Symbols
The WARNING sign denotes a hazard. It calls attention to a procedure, practice or the like which,
if not correctly performed or adhered to, could result in injury or loss of life. Do not proceed beyond
a WARNING sign until the indicated conditions are fully understood and met.
The CAUTION sign denotes a hazard. It calls attention to an operating procedure, practice, or the like,
which, if not correctly performed or adhered to could result in damage to or destruction of part or all of
the equipment. Do not proceed beyond a CAUTION sign until the indicated conditions are fully understood
and met.
Grounding Requirements
The synthesizer is equipped with a three-conductor power cord which, when plugged into an appropriate
receptacle grounds the instrument. The offset pin on the power cord three-prong connector is the ground wire.
Rack Installation
This instrument can be rack mounted by using a rack mounting kit.
Rack Mounting kit; 2 brackets that are attached to the sides of the instrument by 4 M5 screws.
Installation of Instrument Stand (optional)
An instrument stand can be attached to the unit using the instrument stand kit.
Instrument stand kit: 2 stands (right, left) that are attached to the sides of the instrument by 4 M5 screws
(same screws as for rack installation).
Repackaging for Shipment
The following is a general guide for repackaging for shipment.
NOTE: If the instrument is to be shipped to Cwejman Sound for service or repair, attach a tag to the
instrument identifying the owner and indicating the service or repair to be carried out, include the serial
number. Place the instrument in its original container if available. If the original container is not available
wrap the instrument in heavy paper or plastic before placing in an inner container. Use plenty of packing
material around all sides of the instrument and protect panel faces with cardboard strips.
Place the instrument and inner container in a heavy carton or wooden box and seal with strong tape or
metal bands. Mark the shipping container DELICATE INSTRUMENT or FRAGILE.
Warm up time
After start up the unit requires 5 to 10 minutes to allow circuits to stabilise.
Specification
The following is an account of the entire unit and the technical performance of each individual module.
In addition there is a more detailed description of the characteristics of the unit's functions including
descriptions of the modules, measurements of waveforms, spectrum analysis, frequency response, etc.
3
WEIGHT 5 kg
DIMENSIONS 440mm (L), 215mm (H), 70mm (D)
POWER 115/230Vac ± 10%, 20VA

The S1 is a semi-modular, analogue monophonic synthesizer. It is easy to get started with since it is pre-
patched for optimal use of its sound producing possibilities and eliminates the need for external connections
between modules during use. Each module can be disconnected and used separately, e.g. to control or be
controlled by other instruments. This flexibility enables and simplifies experimentation with creation and
reproduction of sound.
We can mention some important features of the S1:
* Three oscillators with seven basic waveforms
* Ring modulator
* Noise generator with two three noise shapes
* Low pass filter with selectable 4 / 6 poles and quasi band pass mode
* Multi mode filter with selectable 2 to 6 poles and three modes
* Wide range envelope generators
* Master amplifier with build-in overdrive stage
* LFO with seven basic waveforms and wide rate range
* Extensive modulation of, virtually, all synthesis parameters
* Build-in MIDI to CV/gate converter with 16-bit resolution
Several parameters can be voltage controlled by external signals and, simultaneously, control external devices
by the build-in MIDI converters voltage outputs (see Rear Panel). The S1 is a stand alone instrument and the
possibility with patching and integrating it into an external modular (or semi-modular) synthesizer makes it
extremely flexible.
Introduction
4
Connections
Power; Connect the included power cable with a 115/230Vac outlet.
BEFORE YOU TURN ON THE MACHINE, BE SURE TO CHECK THE VOLTAGE SELECTOR POSITION
ON THE REAR.
AUDIO
Connect the INSTRUMENT OUTPUT of the S1 to your audio system. Use a single-ended or balanced
output cable, depending on what your audio system has to offer. For best audio performance, use the
balanced output. Please refer to your audio systems instruction for reference.
MIDI
If you want to play the S1 via MIDI, connect S1's MIDI IN to the MIDI OUT of your MIDI controller.
Select the corresponding MIDI channels on both the S1 and your MIDI controller.
All MIDI functions of the S1 are explained in detail later in this manual. Please also refer to the instructions
of your MIDI system/controller.
CV/GATE
If you want to play via CV/GATE equipped devices, please use the ANALOGUE INPUTS on the S1 rear panel.
Connect S1's CV IN to the CV OUT (1 Volt/octave) of your analogue sequencer or keyboard and connect
the GATE and/or Trigger or S-Trigger to the appropriate output of your analog controlling device.
MIDI INTERFACE MIDI IN (and programming), MIDI OUT (only program verification)
and MIDI THRU
MIDI OUTPUTS
CV1 Fixed: main pitch, 0 to 10 Volts (10 octaves)
CV2 Factory preset: Note on Velocity, 0 to 5 Volts
CV3 Factory preset: Control Change #05,
Modulation Wheel, 0 Volt ± 5 Volts
CV4 Factory preset: Channel After Touch, 0 to 5 Volts
MASTER CV CV1 incl. all controllers in the Master Controller
GATE1 +15 Volts active
TRIGG1 +15 Volts active
GATE2 +15 Volts active
TRIGG2 +15 Volts active
S-TRIG Inverted gate, short circuit active
MIDI CHANNEL MIDI channel selector
ANALOG
INPUTS
CV Main pitch, 1 Volt/ octave
GATE Envelope generator gate, 1 Volt threshold
TRIGG Envelope generator trigger, 1 Volt threshold
S-TRIG Inverted gate, short circuit active

5
CALIBRATION
OSC1, OSC2, OSC3, SCALE; 1 Volt/octave
OSC1, OSC2, OSC3, RANGE; ’RANGE’ octave steps
MASTER, SCALE; general scale sensitivity calibration
MASTER, ANALOG CV INPUT; 1 Volt/octave
MAINS INLET
Power cord inlet
115/230 V
SELECTOR
Switch for mains voltage selection
INSTRUMENT
OUTPUTS
BALANCED, 16 dBVmax @ 600 ohm (rear panel)
SINGLE ENDED, 10 dBVmax (front and rear panel)
GETTING STARTED
We guess that the first of all, you want to hear how the S1 sounds. Before you get deeper into this manual
and all the functions of the S1, please take a short tour and make yourself familiar with some of the S1 basics.
Before you power up the S1, turn down the output level knob. The S1 can produce high output levels and
you should make sure not to burn your valuable preamp, speakers or even more, your valuable ears.
FIRST power up the S1 and then turn on your audio system.
Now please bring the controls of the S1 to a simple basic setting:
You can also use this setting as an initial "reset"-patch to where you can go back to as a starting point for
new sounds.
As soon you press a key on your keyboard (or start your sequencer), you should hear the sound of a simple
bass-lead. You may also copy the picture on next page and fill in your own settings.

6
Now begin to experiment:
- Turn the FILTER MIX knob in the MASTER AMP section in position LPF or MMF to hear signals of all
oscillators.
- Change the waveforms and tunings of the oscillators.
- Change the setting of the LPF- and MMF sections (CUTOFF, Q-PEAK, POLE, MODE) and move
the FILTER MIX knob in the MASTER AMP section. See how timbres are changing?
- Turn up the CUTOFF MODULATION (CM) knobs and experiment with the ENVELOPE GENERATOR
settings to add dynamic timbre changes to the sound.
Experiment with the parameters and try to become familiar with the S1. If something might behave
unexpectedly, please be patient. All related issues will be explained in this manual and with some practice,
you will soon be able to manage the S1 and create a universe of great sounds.
Patchbay
Master Controller
The Master Controller section determinates the master frequency and/or modulation depth to all modules
coupled to it, such as oscillators and filters. The four knobs are easy to understand:
MODULATION LEVEL is pre-patched to the LFO output and determinates the master modulation depth being
aplied to the incomming pitch CV (CV1), hereby modulating all oscillators and filters connected to the master
CV bus.
GLIDE determinates the time to glide from one note to another in 5 octave span.
TRANSPOSE is the master octave setting (± 3 octaves).
FINE TUNE (± 3 semitones).
The three MASTER CV switches disconnect the corresponding
oscillator from the incomming pitch CV. The oscillators are not
tracked anymore by an e.g. keyboard, thus allowing the creation
of sounds that are not related to a tonal scale.
All oscillators FM LEVEL (controlled by knobs) are calibrated (1 Volt/octave) and can be controlled by an
external sequencer or other CV source with calibrated 1Volt/octave signal.
MODULATION INPUT sockets; the inputs for individual
frequency control of the three oscillators are internally pre-
patched to the LFO's output, OSC1's output and OSC2's
output (as you can see on the labelling of these sockets).
The LFO's output is also pre-patched to the modulation
input for the master controller.
As we mentioned before, the S1 is a semi-modular system. All modules inputs and outputs are pre-patched
and can be altered or added by the use of patch-cords. To make the use of the patching capabilities most
easy as possible, there is a specific legend used on all sockets:
- Audio and CV outputs are revealed by red surround.
- Inputs are labelled in white text.
- Where an input is pre-patched internally, its source
is labelled red in a white box. These internal patches
are bypassed as soon as you insert a plug.
Since all outputs all short circuit protected,
there is no danger to couple output to output.