Instruo cruinn Manuel utilisateur
cruïnn
Analogue Stereo Oscillator
User Manual
2
Contents
3
Description / Features
4
Installation / Specifications
5
Overview
6
Waveforms & Frequency/Pitch
7
Frequency Modulation
8
Amplitude Modulation
9
Phase Modulation
11
Waveform & CV Expansion
12
Patch Examples
- East Coast Synth Voice
- Super Saw Synth Voice
- Stereo Super Saw
- FM Synth Voice
- Apocalypse Helicopter
3
Description
The Instruō cruïnn is an analogue stereo oscillator that utilises through-
zero phase modulation to create deep, animated textures.
On top of its single sawtooth oscillator core, cruïnn produces five
additional parallel phase-displaced sawtooth variants – each
controlled by their own discrete internal triangle waveform LFO. With
both on-board and external control over the LFO rates and modulation
depths, cruïnn effortlessly creates, super-super-super-super-super saws,
lush pads, phasey basses, and chaotic effects.
With cruïnn’s included passive 4 HP Expander, access to all six
waveforms are available. Add to that the ability to individually displace
the phase of each waveform via CV and cruïnn becomes an amorphous
swarm of harmonically rich sawtooths.
Features
• Stereo and summed outputs
• Six phase-displaced sawtooth variants
• Five internal triangle waveform LFOs
• Global rate and depth modulation controls
• Built-in stereo VCA
• Linear and exponential frequency modulation
• LFO functionality
• Includes 4 HP passive waveform and CV expansion module
4
Installation
1. Confirm that the Eurorack synthesizer system is powered off.
2. Locate 14 HP of space in your Eurorack synthesizer case. Locate an
additional, but optional 4 HP of space in your Eurorack synthesizer
case for the included expander.
3. Connect the 6 pin side of both IDC expansion cables to both of the
2x3 pin headers on the back of the main module, confirming that
the red stripes on the expansion cables line up with the indicators on
the main module.
4. Connect the 6 pin side of both IDC expansion cables to both of the
2x3 pin headers on the back of the expansion module, confirming
that the red stripes on the expansion cables line up with the
indicators on the expansion module.
5. Connect the 10 pin side of the IDC power cable to the 2x5 pin
header on the back of the module, confirming that the red stripe on
the power cable is connected to -12V.
6. Connect the 16 pin side of the IDC power cable to the 2x8 pin
header on your Eurorack power supply, confirming that the red
stripe on the power cable is connected to -12V.
7. Mount the Instruō cruïnn in your Eurorack synthesizer case.
8. Power your Eurorack synthesizer system on.
Note:
This module has reverse polarity protection.
Inverted installation of the power cable will not damage the module.
Specifications
• Width: 14 HP + 4 HP Waveform and CV Expansion Module
• Depth: 27mm
• +12V: 180mA
• -12V: 180mA
5
cruïnn | kɾ·i:nºʲ | adjective (shape) well developed in all aspects;
complete and balanced, plump, fat, full-toned or sonorous
Key
1. Left Output
2. Right Output
3. Sigma Output
4. Coarse
5. Fine
6. 1V/Oct Input
7. LFO Toggle
8. FM Input
9. FM Attenuator
10. Lin/Exp Toggle
11 . Level
12. Level CV Input
13. Level CV Attenuator
14. Rate
15. Rate Modulation CV Input
16. Rate Modulation CV Attenuator
17. Depth
18. Depth Modulation CV Input
19. Depth Modulation CV Attenuator
20. Individual Waveform Outputs
21. Individual Rate Modulation CV Inputs
cruïnn
R
L
1V/OCT
LFO
FM
LEVEL
CV
CV
RATE
MODULATION
COARSE
DEPTH
FINE
Σ
LIN EXP
±360º
CV α
β
γ
δ
ε
ζ
4
2
3
8
9
11
1
Module Expander
5
6
12 13
1415 16
17
18 19
20
20
20
20
20
20
21
21
21
21
21
7
10
6
Waveforms
Right: The Right jack outputs bipolar sawtooth waveforms 1, 2, and 3.
Left: The Left jack outputs bipolar sawtooth waveforms 4, 5, and 6.
Sigma ( ): The Sigma ( ) jack outputs of all bipolar
sawtooth waveforms.
Frequency / Pitch
Coarse: The Coarse knob controls the fundamental frequency
of the oscillator’s core. It determines the fundamental pitch of the
core waveform.
• Turning the knob anticlockwise will decrease the frequency.
• Turning the knob clockwise will increase the frequency.
Fine: The Fine knob is used for minute control of the oscillator’s
fundamental frequency and is relative to the frequency value set by
the Coarse knob. It also determines the fundamental pitch of the
core waveform.
• Turning the knob anticlockwise will decrease the frequency.
• Turning the knob clockwise will increase the frequency.
1V/Oct: The 1V/Oct input is a bipolar control voltage input that is
calibrated to 1 Volt per Octave.
• This is traditionally used with pitch-related control voltages sent from a
sequencer or keyboard.
• Control voltage is summed with the values set by the Coarse and Fine
knobs.
LFO: The LFO toggle lowers the frequency ranges of the waveforms,
allowing for oscillations within subsonic territory.
Σ Σ
7
Frequency Modulation
FM: The FM input is a bipolar control voltage input for the
frequency parameter.
• Control voltage is scaled by the FM Attenuator and summed with
the values set by the Coarse and Fine knobs as well the value set by
the 1V/Octave input.
FM Attenuator: The FM Attenuator determines the depth of frequency
modulation applied to the fundamental frequency.
• Turning the knob anticlockwise will decrease the depth of
frequency modulation if an external signal is present at the
FM input.
• Turning the knob clockwise will increase the depth of
frequency modulation if an external signal is present at the
FM input.
Lin/Exp: The Lin/Exp toggle sets the FM input to have either a linear
FM or exponential FM response curve.
• If the toggle is set to the left position, the FM signal will apply with
linear scaling.
• When modulated with a linear FM response, negative voltage
will result in an increase in frequency while positive voltage will
result in a decrease in frequency.
• If the toggle is set to the right position, the FM signal will apply with
exponential scaling.
• If the toggle is set to exponential FM and the FM Attenuator is
fully clockwise, the FM input will essentially track at 1V/Octave
(Its tracking may slightly differ from the calibrated
1V/Oct input).
8
Amplitude Modulation
Level: The Level knob determines the amplitude of the stereo
and Sigma ( ) outputs.
• Turning the knob anticlockwise will decrease the output amplitude.
• Turning the knob clockwise will increase the output amplitude.
• To eliminate any chance of hard clipping that may occur when
parallel sawtooth waves sum with perfect phase alignment, a soft
clipping circuit is implemented and limits the amplitude range to
~10Vpp. This essentially turns the built-in VCA into a voltage-
controlled saturator that can accentuate a nonlinearity of the
sawtooth waveforms.
Level CV: The Level CV input is a bipolar control voltage input for the
Level parameter.
• Control voltage is summed with the Level knob position.
Level CV Attenuator: The Level CV Attenuator determines the depth of
modulation applied to the Level parameter.
• Turning the knob anticlockwise will decrease the depth of
amplitude modulation if an external signal is present at the
Level CV input.
• Turning the knob clockwise will increase the depth of
amplitude modulation if an external signal is present at the
Level CV input.
Σ
9
Phase Modulation
Rate: The Rate knob controls the rate of the five triangle waveform
LFOs used for phase modulation of the five phase-displaced
sawtooth variants.
• Turning the knob anticlockwise will decrease the rate of the triangle
waveform LFOs down to stalling.
• Turning the knob clockwise will increase the rate of the triangle
waveform LFOs.
Rate Indicators: The Rate Indicators are LEDs that show the rate of each
triangle waveform LFO.
100Hz
100Hz
75Hz
75Hz
1Hz
Waveform OutputsAnticlockwise
Clockwise
0Hz
0Hz
0Hz
0Hz
0Hz
10
Rate Modulation CV: The Rate Modulation CV input is a bipolar
control voltage input for the Rate parameter.
• Control voltage is summed with the Rate knob position.
Rate Modulation CV Attenuator: The Rate Modulation CV Attenuator
determines the depth of modulation applied to the Rate parameter.
• Turning the knob anticlockwise will decrease the depth of LFO
rate modulation if an external signal is present at the
Rate Modulation CV input.
• Turning the knob clockwise will increase the depth of LFO
rate modulation if an external signal is present at the
Rate Modulation CV input.
Depth: The Depth knob controls the depth of phase modulation applied
to the five phase-displaced sawtooth variants by the five triangle
waveform LFOs.
Depth CV Modulation: The Depth CV Modulation input is a bipolar
control voltage input for the Depth parameter.
• Control voltage is summed with the Depth knob position.
Depth Modulation CV Attenuator: The Depth Modulation CV
Attenuator determines the depth of modulation applied to the
Depth parameter.
• Turning the knob anticlockwise will decrease the depth of
Depth modulation.
• Turning the knob clockwise will increase the depth of
Depth modulation.
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