AtomoSynth KOE 7 Vactrol User manual

AtomoSynth KOE 7 Vactrol / Ladder
User Manual

The KOE 7 is a complete synthesizer voice in one module, featuring all the basic submodules
like an oscillator, low-frequency oscillator, filter*, and envelope generator, these are internally
pre-connected so it produces a classic synth sound with the minimum patching (only CV and
gate signals), however, each submodule can be used individually thanks to its extensive patch
bay.
*There are two versions of the KOE 7: the KOE Vactrol with 12db/oct vactrol HP, and LP filter.
and KOE Ladder with 24dB/oct ladder LP filter.
Specs:
● One voltage-controlled oscillator VCO, with Triangle, Pulse, and Saw waveforms.
● Folding effect control knob for the triangle waveform and pulse width, for the pulse
waveform, also controllable by CV.
● Square wave sub-oscillator with 1, 2, or 3 octaves below the main oscillator.
● Tune and Fine Tune knobs for the main oscillator.
● Glide effect knob.
● One LFO with triangle, positive square, and saw waveforms, with attenuverter and
frequency range switcher.
● 12dB/oct Vactrol-based filter with low pass and high pass independent inputs. (KOE
Vactrol version only).
● 24dB/oct Low Pass ladder filter (KOE Ladder version only).
● One ADSR-type envelope generator.
● Current draw: 55mA +12V. 16mA -12V. 0mA +5V.
● 24HP wide.
● 25mm deep.
Sub-Module controls.
Oscillator:
1. OSC knob: Sets the volume level of the oscillator.
2. GLIDE knob: Controls the time of the glide effect (portamento).
3. Waveform Switcher: This sets the oscillator output waveform to Triangle (upper position)
Pulse (mid position) and Sawtooth (lower position).

4. SUB knob: Sets the volume level of the square wave sub-oscillator.
5. Sub-Octave Switcher: This sets the octave of the sub-oscillator to -1, -2, or -3 octaves
below the main oscillator.
6. PW/Fold knob: This knob sets the depth of the Folding effect when the Waveform
Switcher is set to triangle wave. And when the Waveform switcher is set to Pulse wave,
it sets the pulse wave's width.
7. TUNE knob. Sets the Tune of the oscillator.
8. FINE knob. Sets the fine tune of the oscillator.
Low Frequency Oscillator.
1. LFO.fq knob: Sets the Frequency of the Low frequency oscillator.
2. LFO.Lvl knob: Controls the level of the Low frequency oscillator. This is an attenuverter
(attenuator-inverter), meaning that in the middle setting, the level is zero and increases
moving it clockwise. Moving it counterclockwise it inverts the signal and increases its
level.
3. LFO Waveform Switcher: This sets the LFO output waveform to Triangle (upper
position) Positive Square (mid position) and Sawtooth (lower position).
4. LFO Range Wsitcher: It sets the Frequency range of the LFO to LOW frequency (upper
position) or HIGH frequency (lower position).
Filter
1. CUTOFF knob: sets the cut-off frequency of the filter.
2. PEAK knob: Sets the peak or resonance level of the filter.
Envelope Generator
1. Aknob: Sets the attack time of the envelope generator.
2. Dknob: Sets the decay time of the envelope generator.
3. Sknob: Sets the sustain level of the envelope generator.

4. Rknob: Sets the release level of the envelope generator.
5. EG.Lvl knob: Sets the level of the output of the envelope generator.
Patch bay connectors
1. 1V/Oct jack: It is a voltage input and controls the pitch of the oscillator, it is calibrated to
1 volt per octave. This input goes to the Glide module first and its output is fed to the
oscillator.
2. EXT jack: It is an external audio input, it will be mixed with the oscillator and
sub-oscillator signals.
3. MIX jack: It is a CV/audio output, it presents the mix of the oscillator, sub-oscillator, and
external input mix.
4. FM jack: it is a Voltage input, and directly controls the oscillator's frequency.
5. PW/Fold jack: It is a Voltage input. It controls the depth of the folding effect when the
oscillator waveform is set to triangle wave. When the oscillator waveform is set to pulse,
it controls the pulse width.
6. LFO.cv jack: It is a voltage input, it controls the frequency of the LFO (low-frequency
oscillator).
7. LFO jack: It is a voltage output, it presents the signal of the low-frequency oscillator
attenuated/inverted by the LFO.Lvl knob.
8. LP jack: it is an audio input, it is the input of the low pass section of the filter. It is
internally connected to the MIX jack output signal, when a cable is connected to the LP
jack it disconnects for the MIX signal.
9. HP jack (KOE Vactrol version only): it is an audio input, it is the input of the high pass
section of the filter.
10. PEAK.cv jack (KOE Ladder version only): it is a voltage input and controls the peak or
resonance level frequency of the filter.
11. CUTOFF.cv jack: it is a voltage input and controls the cutoff frequency of the filter.
12. FILTER jack: It is the audio output of the filter, here is presented the mix of the HP and
LP sections. In the KOE ladder version, this jack presents the low-pass output signal
only.
13. GATE jack: it is a voltage input from 5Volt to 10Volt used to trigger the envelope
generator.

14. EG jack: It is a voltage output, it presents the output of the envelope generator
attenuated by the EG.Lvl knob. It is internally connected to the filter to control the CutOff
frequency. When a cable is connected to the EG jack it disconnects from the filter.
15. VCA.cv jack: It is a voltage input and controls the level of the VCA voltage-controlled
amplifier. It is internally connected to the output of the envelope generator. When a cable
is connected to the VCA.cv, it gets disconnected from the envelope generator.
16. VCA jack: It is the audio input of the voltage-controlled amplifier VCA. It is internally
connected to the filter output. When a cable is connected to the VCA jack, it gets
disconnected from the filter.
17. AUDIO jack: It is the audio output of the VCA and is attenuated by the VOLUME knob.
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