Title: Theory / Unimportant / Art / Instrument / Synthetizer / Arturia Polybrute

Question: How many voices have the Arturia Polybrute
Answer: 6
Context: Arturia Polybrute

Instruction: [Settings]
Effect: Access the Preset/Global option menus
Context: Arturia Polybrute

Page: 9
Effect: Adjust the stereo spread of the output signal
Context: Arturia Polybrute

Page: 9
Effect: adjust \(\pm1\) semitone from the knob's center detent
Context: Arturia Polybrute

Page: 9
Effect: Volume for the front jack output
Context: Arturia Polybrute

Page: 9
Effect: Volume for the back sound output
Context: Arturia Polybrute

Instruction: VCO calibration
Page: 10
Effect: Tunes both oscillators for each voice
Context: Arturia Polybrute
Chapter: 2
Section: 3

Instruction: VCF calibration
Page: 10
Effect: Tune both filters for each voice
Context: Arturia Polybrute
Chapter: 2
Section: 3

Variable: Knob catch
Meaning: When a setting set a knob K in position P to a value V, and you touch P, which value should it know have
Page: 10
Context: Arturia Polybrute
Section: 4
Chapter: 2
Value: Hook - a control must sweep past the stored value before it changes the parameter. Benefit: smooth changes.
Value2: Jump - the value jumps to the position of the control as soon as you move it. Benefit: instant response.
Value3: Scaled - the parameter changes from its stored value when the control moves,
and the range is scaled (averaged) to cover the remaining values in that
direction. When the control direction is reversed the normal parameter range
is restored. Benefit: instant response and smooth changes. This is the default
setting.

Name: Bank
Definition: A set of 96 presets, accessible by a number from 1 to 8
Page: 11
Chapter: 2
Section: 5
Context: Arturia Polybrute

Name: Patch
Definition: Some settings for each configuration
Page: 11
Chapter: 2
Section: 5
Context: Arturia Polybrute
Name2: Preset
Denoted by: BankNumber.RowColumn

Question: What to do if ARP is pressed and no arpeggio plays
Answer: Make sure settings/Sync is set to auto
Page: 12
Chapter: 2
Section: 6.2
Context: Arturia Polybrute

Meaning: On which channels the edits we are performed the edit we make
Page: 12
Context: Arturia Polybrute
Language: Patch
Section: 6.2
Chapter: 2

Definition: The ratio of any circle to its diameter
Page: https://en.wikipedia.org/wiki/Pi
Notation: \(\pi\)
Definition2: \(\int_{-1}^1\frac{dx}{\sqrt{1-x^2}} \)
Definition4: \(2\prod_{n\in\mathbb N^*}\frac{2n}{2n-1}\frac{2n}{2n+1}\)
Definition5: \(\frac12\left(\prod_{n\in\mathbb N^*}\frac2{\sqrt{2+\sqrt{2+\dots\sqrt{2}}}^{n\texttt{ time}}}\right)\)
Definition6: \(4\sum_{n\in\mathbb N^*}(-1)^n\frac{1}{2n-1}=4\arctan(1)\)
Definition7: \(\sum_{n\in\mathbb N}(-1)^n\frac{4}{2n+1}\) the Gregory-Leibniz series
Definition8: \(3+\sum_{n\in\mathbb N^*}(-1)^{n+1}\frac4{2n(2n+1)(2n+2)}\)
Definition9: \(\sqrt{6\sum_{n\in\mathbb N^*}\frac{1}{n^2}}\)
Definition10: \(\left(\frac{2\sqrt 2}{9801}\sum_{k\in\mathbb N}\frac{(4k)!(1103+26390k)}{k!^4(396^{4k})}\right)^{-1}\)
Definition11: \(\left(\frac{12}{640320^{\frac{3}2}}\sum_{k\in\mathbb N}\frac{(6k)!(13591409+545140134k)}{(3k)!k!^3(-640320)^{3k}}\right)^{-1}\)
Definition12: Buffon's needle. Approximately \(\frac{2n\ell }{xt}\) with \(n\) needles of length \(\ell\) units, dropped randomly on a floor with parallel stripes \(t\) units appart, \(x\) the number of needles crossing a stripe
Definition13: \(\lim_{n\to\infty}\frac{2n}{E[|W_n|]^2}\) with \(W_n\) the position after a random walk of length \(n\)
Definition14: \(\sum_{k\in\mathbb N}\frac{1}{16^k}\left(\frac{4}{8k+1}-\frac{2}{8k+4}-\frac{1}{8k+5}-\frac{1}{8k+6}\right)\) allowing to compute hexadecimal digits of \(\pi\) individually

Name: Voltage-controlled oscillators
Definition: generate the waveforms and control the pitch frequency
Page: 13
Chapter: 3
Section: 1
Context: Arturia Polybrute
Abbreviation: VCO

Name: Voltage-controlled filters
Definition: Shape the harmonic content
Page: 13
Chapter: 3
Section: 1
Context: Arturia Polybrute
Abbreviation: VCF

Question: basic signal flow
Answer: VCO
Page: 13
Chapter: 3
Section: 1
Context: Arturia Polybrute
Answer2: VCF
Answer3: Envelopes, LFOs, and other sources are used to alter (modulate) parameters. Modulators can even control other modulators.
Answer4: Voltage-controlled filters
Answer5: Finally the signal passes through the amplifier section,
Answer6: takes a detour into the effects section (if desired)
Answer7: and then the output level is set by the Master Volume control.

Question: Which banks have presets
Answer: Bank sets 1 to 4
Page: 14
Chapter: 3
Section: 2.1
Context: Arturia Polybrute

Page: 14
Effect: Create a preset in the current patch
Context: Arturia Polybrute
Chapter: 3
Section: 2.1
Name: Voltage-controlled filters

Variable: first lamp
Meaning: whether sound is sent to Steiner Filter
Page: 15
Context: Arturia Polybrute
Section: 2.1
Chapter: 3

Variable: second lamp
Meaning: whether sound is sent to Ladder Filter
Page: 15
Context: Arturia Polybrute
Section: 2.1
Chapter: 3

Instruction: left button
Page: 15
Effect: turn on/off the two lamps to send to Steiner/Ladder filter
Context: Arturia Polybrute
Chapter: 3
Section: 2.1

Meaning: Set the basic pitch of the VCO
Page: 15
Context: Arturia Polybrute
Section: 2.2
Chapter: 3

Meaning: The superposition of sawtooth and triangle waveform to use
Page: 16
Context: Arturia Polybrute
Section: 2.2.1
Chapter: 3
Assuming: Useful only if is not entirely on square

Meaning: The superposition of (sawtooth and triangle waveform as selected by ) and of square waveform to use
Page: 16
Context: Arturia Polybrute
Section: 2.2.1
Chapter: 3

Name: Wavefolding
Definition: Transforming into
Page: 16, 23
Chapter: 3, 4
Section: 2.2.2, 3.3.1
Context: Arturia Polybrute

Variable: Metalizer
Meaning: adds intense harmonics to the triangle waveform (other waveform can be selected in the settings)
Page: 16
Context: Arturia Polybrute
Section: 2.2.2
Chapter: 3
Extra: through a process known as wavefolding

Variable: Pulse width
Meaning: adjusts the distance between the rising and falling edges of a square wave.
Page: 16, 22
Context: Arturia Polybrute
Section: 2.2.2, 3.2.1
Chapter: 3, 4

Name: Low pass
Definition: Anything below the corner frequency is allowed to pass. Anything above is gradually filtered out.
Page: 17
Chapter: 3
Section: 2.3
Context: Arturia Polybrute
Abbreviation: LP

Variable: Cutoff
Meaning: Position of the cutoff
Page: 17
Context: Steiner Filter
Section: 2.3
Chapter: 3

Variable: Resonnance
Meaning: How much to emphasize the corner frequency of the filter
Page: 17
Context: Steiner Filter
Section: 2.3
Chapter: 3

Name: High pass
Definition: Anything above the corner frequency is allowed to pass. Anything below is gradually filtered out.
Page: 17
Chapter: 3
Section: 2.3
Context: Arturia Polybrute
Abbreviation: HP

Name: A Notch filter
Definition: A filter that removes frequency in the middle.
Page: 17
Chapter: 3
Section: 2.3
Context: Arturia Polybrute

Name: A band pass
Definition: allows a center band of frequencies to pass and filters out the higher and lower frequencies
Page: 17
Chapter: 3
Section: 2.3
Context: Arturia Polybrute

Variable: Brute factor
Meaning: adds distortion by feeding the filter output back into itself.
Page: 18
Context: Arturia Polybrute
Section: 2.3.1
Chapter: 3
Extra: This can be subtle or wild.

Variable: VCF Env Amt
Meaning: routes VCF 1 through VCF ENV.
Page: 18
Context: Arturia Polybrute
Section: 2.3.1
Chapter: 3
Extra: Lower the Cutoff to make headroom for the envelope.

Name: Voltage-controlled amplifier
Definition: the final output stage prior to the Effects
Page: 18
Chapter: 3
Section: 2.3.1
Context: Arturia Polybrute
Abbreviation: VCA

Name: FOO Env
Definition: Tool to shape the amplitude of FOO
Page: 18
Chapter: 3
Section: 2.3.1
Context: Arturia Polybrute
Etymology: FOO Enveloppe

Variable: Attack
Meaning: the time it takes the envelope to reach its full level
Page: 18
Context: Arturia Polybrute
Section: 2.3.4
Chapter: 3

Variable: Decay
Meaning: how long it takes the envelope to reach the Sustain level.
Page: 18
Context: Arturia Polybrute
Section: 2.3.4
Chapter: 3

Variable: Sustain
Meaning: the target level for the Decay
Page: 18
Context: Arturia Polybrute
Section: 2.3.4
Chapter: 3
Extra: The envelope decays until it reaches this level, unless the key is released before it gets there.

Variable: Release
Meaning: how long it takes the envelope to fade out after the key is released
Page: 18
Context: Arturia Polybrute
Section: 2.3.4
Chapter: 3

Variable: Velo  (velocity)
Meaning: How much the force at which the key is pressed impact the dynamic range of the note played
Context: Arturia Polybrute

Variable: Button color on the matrix
Context: MOD mode
Value: Turned off: there is no connection in this intersection
Value2: Blue: there is a connection at this intersection
Value3: Purple: the "Amount" knob control the connection at this intersection

Meaning: Setting of the currently purple connection
Context: MOD mode

Instruction: Touching a matrix button
Effect: If it is selected (purple) turn it off. Otherwise select it
Context: MOD mode

Name: Assign button n
Context: MOD mode
Notation: under the display
Extra: Todo: put in the oclusion image

Instruction: Maintain Assign button n. Touch the slider s
Effect: Column n's destination is slider s
Context: MOD mode
Variables: \(1\le n\le 8\)
s a slider or knob
Name: Assign button n
Notation: under the display

Instruction: Maintain setting + touch the object o
Page: 21
Effect: Open the settings for o
Context: Arturia Polybrute
Chapter: 4
Variables: o an object of the pannel with an orange circle
Abbreviation: maintain o pressed (if it's a button)
Name: Assign button n

Variable: the lamp on the top right
Meaning: Whether tune is as a perfect octave (e.g. -2, -1, 0, +1 or +2 octave)
Context: VCO 1

Variable: tune
Meaning: how to tune the sound (e.g. add/remove sound).
Chromatically with the pot, but may be smooth or by different scales in modular matrix
Context: VCO 1

Question: How does sound a pure square wave?
Answer: A clarinet
Page: 22
Chapter: 4
Section: 3.2.1
Context: Arturia Polybrute

Variable: Sync 2 > 1
Meaning: How hardly VCO 1 should be synchronized to VCO2.
Page: 23
Context: Arturia Polybrute
Section: 3.3.1
Chapter: 4

Name: The sub-oscillator
Definition: An oscillator that produces a sine wave an octave below the fundamental pitch of the VCO 2
Page: 2
Chapter: 4
Section: 3.4.1
Context: Arturia Polybrute

Variable: Sub
Meaning: VCO 2 Output's percent of VCO2 oscillator and of sub-oscillator
Page: 24
Context: Arturia Polybrute, VCO2
Section: 3.4.1
Chapter: 4

Name: Frequency Modulation
Definition: when the frequency of one oscillator is used to modulate the frequency of another
Page: 24
Chapter: 4
Section: 3.4.1
Context: Arturia Polybrute
Abbreviation: FM

Variable: FM > 1
Meaning: How much VCO 1 takes frequency modulation from VCO 2
Page: 24
Context: Arturia Polybrute
Section: 3.4.1
Chapter: 4

Name: Noise
Definition: A random series of frequencies and amplitudes
Page: 25
Chapter: 4
Section: 3.5
Context: Arturia Polybrute

Name: White noise
Definition: todo?
Page: 25
Chapter: 4
Section: 3.5
Context: Arturia Polybrute
Intuition: Sounds like strong rain, or sand moving.

Name: Red noise
Definition: todo?
Page: 25
Chapter: 4
Section: 3.5
Context: Arturia Polybrute
Intuition: Dark (?). Sounds like heavy materials pulled on the floor

Name: Low Frequency Oscillator
Definition: Modulation source to affect other parameters
Page: 26
Chapter: 4
Section: 5
Context: Arturia Polybrute
Abbreviation: LFO

Question: What are Polybrute's LFO possible frequencies
Answer: From \(\frac 1{50}\) to 100 Hz
Page: 26
Chapter: 4
Section: 5
Context: Arturia Polybrute

Variable: Phase
Meaning: where the LFO wave cycle starts relative to the note trigger (left is the beginning of the note)
Page: 26
Context: LFO 1, Arturia Polybrute
Section: 5
Chapter: 4

Variable: Fade In
Meaning: offsets the start of LFO 2 and also fades it in graduall
Page: 26
Context: LFO 2, Arturia Polybrute
Section: 5
Chapter: 4

Variable: Sync
Meaning: locks the LFO to the Seq / Arp tempo
Page: 26
Context: LFO, Arturia Polybrute
Section: 5
Chapter: 4
Extra: which can be synced to external sources

Variable: Rate
Meaning: the LFO frequency
Page: 26
Context: LFO, Arturia Polybrute
Section: 5
Chapter: 4

Variable: lamp on the top-right
Meaning: Shows the frequency of the LFO
Page: 26
Context: LFO, Arturia Polybrute
Section: 5
Chapter: 4

Variable: Waveform
Meaning: Move left and right between different waveforms
Page: 26
Context: LFO, Arturia Polybrute
Section: 5
Chapter: 4

Variable: Mode
Meaning: the way the LFOs respond to note triggers and retriggers
Page: 26
Context: LFO, Arturia Polybrute
Section: 5
Chapter: 4
Value: Mono - The LFO oscillates on its own. The wave could be anywhere in its cycle when a note is triggered, and all notes share the same LFO.
Value2: Poly - Each voice has an independent, free-running LFO. If a voice is retriggered, the LFO does not reset.
Value3: Poly>Retrig - Each voice triggers an independent LFO. If the same voice is retriggered, the LFO resets

Name: Sine
Page: 26
Chapter: 4
Section: 5
Context: Arturia Polybrute, oscillator

Name: Triangle
Page: 26
Chapter: 4
Section: 5
Context: Arturia Polybrute, oscillator

Name: Sample & hold
Page: 26
Chapter: 4
Section: 5
Context: Arturia Polybrute, oscillator

Name: Slewed random
Page: 26
Chapter: 4
Section: 5
Context: Arturia Polybrute, oscillator

Name: Sawtooth
Page: 26
Chapter: 4
Section: 5
Context: Arturia Polybrute, oscillator

Name: reverse sawtooth
Page: 26
Chapter: 4
Section: 5
Context: Arturia Polybrute, oscillator

Name: Square
Page: 26
Chapter: 4
Section: 5
Context: Arturia Polybrute, oscillator

Name: Linear curve
Page: 26
Chapter: 4
Section: 5
Context: Arturia Polybrute, oscillator curve

Name: Logarithmic curve
Page: 26
Chapter: 4
Section: 5
Context: Arturia Polybrute, oscillator curve

Name: Exponential curve
Page: 27
Chapter: 4
Section: .25
Context: Arturia Polybrute, oscillator curve

Variable: Curve
Meaning: the LFO shape
Page: 27
Context: LFO 3, Arturia Polybrute
Section: .25
Chapter: 4

Variable: Symmetry
Meaning: the ratio between the rising and falling times of the LFO
Page: 27
Context: LFO 3, Arturia Polybrute
Section: .25
Chapter: 4
Extra: without affecting the rate

Variable: Single
Meaning: Whether the LFO stops after one cycle
Page: 27
Context: LFO 3, Arturia Polybrute
Section: .25
Chapter: 4
Extra: LFO3 is unipolar when Single mode is active, and this interacts with [Retrig] in useful ways. With [Retrig] off, LFO3 can be used as a simple attack-decay envelope. With [Retrig] on, LFO3 “freezes” at the end of its rising phase and begins its falling phase only when the released, behaving like an attack-hold-release envelope.

Variable: Retrig
Meaning: toggles LFO response between Mono (dark) and Poly>Retrig (lit)
Page: 27
Context: LFO 3, Arturia Polybrute
Section: .25
Chapter: 4

Variable: x LFO 1
Meaning: modulates LFO 3 with the output of LFO 1.
Page: 27
Context: LFO 3, Arturia Polybrute
Section: 5.2
Chapter: 4
Extra: For example, if LFO 1 is a square wave, the amplitude of LFO 3 is low while the square wave is low, and its amplitude is high when the square wave is high. This enables LFO 3 to generate some very unusual waveforms. Try various rates and waveforms to see what happens. For the most predictable results, activate the Sync button for both LFOs. When [x LFO 1] and [Single] are active, LFO 1 triggers LFO 3 each time LFO 1 begins its cycle.