Chance - Synthesizer Qu-Bit - Free user manual and instructions

Product Type	Eurorack synthesizer module
Brand	Qu-Bit
Model	Chance
Format	14 HP
Depth	34 mm (skiff friendly)
Power Consumption	+12V: 45 mA, -12V: 17 mA
Output Voltage Range	±8 V (all voltage outputs)
Internal Clock Rate	15 seconds to 50 Hz
Clock Output	0-5 V, 50% duty cycle
Burst Output	0-5 V gate bursts with random count and duty cycle
White Noise Output	Analog white noise
Digital Noise Output	Multiply digital square waves at random frequencies
Rhythm Output	Random rhythmic division/multiplication triggers (5 ms)
Algorithm Outputs	Smooth, Discrete, Wavetable, Blend (morphable)
Attenuverters	One per output (Smooth, Discrete, Wavetable, Blend)
Blend Modes	Four algorithms with LED indication (Smooth, Discrete, Wavetable, Blend)
Wavetables	Cosine, Triangle, Saw, Ramp, Stepped Triangle, Inverted Cosine, Inverted Triangle, Inverted Stepped Triangle
Rhythmic Divisions/Multiplications	/4, /2, = (1/4), *2, *4, *8, *3 (triplets), *6 (triplets)
Control Inputs	Rate CV (±5V), Blend CV (±5V), Rhythm CV (±5V), External Clock, Freeze Gate
Buttons	Coin Toss (reseed), Freeze (hold states)
Installation	Standard Eurorack power header (red band to -12V)

Frequently Asked Questions - Chance Qu-Bit

What is the Qu-Bit Chance?

The Qu-Bit Chance is a unique Eurorack modulation module that uses chance operations (inspired by John Cage's I Ching) to generate random musical voltages. It features four algorithms (Smooth, Discrete, Wavetable, Blend), a coin toss reseed, freeze function, and multiple outputs including gate bursts, white noise, and digital noise.

How does the Coin Toss function work?

Pressing the Coin Toss Button reseeds random values for the Smooth, Discrete, Wavetable, Blend, Burst, Digital Noise, and Rhythm outputs on each successive clock pulse. It acts as a trigger for new random selections across the module.

What does the Freeze button do?

The Freeze Button holds all output voltages at their current state. When frozen, the Smooth output continues moving to its current destination then stops, Discrete output stops updating, Wavetable continues at the last clock rate, and the Blend output adopts the frozen behaviors of the three algorithms. Clock inputs are ignored, but the Coin Toss Button can still reseed certain outputs.

How do I use the Blend Output?

The Blend Output allows smooth morphing between the Smooth, Discrete, and Wavetable algorithms plus a fourth 'Blend' algorithm (automated distribution). The Blend Knob and Blend CV (range ±5V) control the mix, with LED indicators showing the selected algorithm. The Blend Output voltage is never identical to any single output.

What are the different algorithms and their outputs?

Chance has four voltage outputs: Smooth (continuously changing random voltage), Discrete (step-like random voltages on clock/reseed), Wavetable (tempo-synced LFO with random wavetable/division selection), and Blend (morph between all three). Each has an attenuverter for level and inversion.

What is the Burst Output?

The Burst Output generates gate bursts at each clock pulse or coin toss. Each burst has a random number of gates, random rests, and random duty cycles. The rate and density are controlled by the Rate Knob and Rate CV. Output range is 0-5V.

How do I sync Chance to an external clock?

Use the Clock Input for external clock signals. The internal clock is ignored when patched. The Clock Output emits a 50% duty cycle clock (0-5V) that can be used to sync other modules. The Rate Knob and Rate CV control the internal rate or affect the Smooth output rate when externally clocked.

What are the rhythmic divisions and multiplications?

The Rhythm Output emits random rhythmic triggers based on divisions (/4, /2, = for quarter notes) and multiplications (*2, *4, *8, *3 triplets, *6 triplets) of the clock. The Rhythm Knob sets probability and range, and the Rhythm CV (range ±5V) modulates it.

How do I install the module?

Locate 14 HP of space in your Eurorack case. Connect the power cable with the red band facing the bottom of the module (negative 12V). Ensure +12V and -12V are correctly aligned. Module depth is 34 mm (skiff friendly). Power draw is 45 mA on +12V and 17 mA on -12V.

Can I use the Digital Noise output as a sound source?

Yes, the Digital Noise output is generated by multiplied digital square waves at random frequencies that reseed on each clock pulse or coin toss. The timbre can be subtly affected by the Blend Knob and Blend CV. It is a continuously changing noise source ideal for percussion or texture.

USER MANUAL Chance Qu-Bit

Description

Chance is a unique modulation source that uses chance operations to create musical voltages. Inspired by John Cage's use of the Chinese divination text, I Ching, Chance generates random voltages in response to a digitally generated coin toss.

Four distinct algorithms provide signals like smooth and discrete, while the wavetable and blend outputs take full advantage of its microcontroller core, utilizing lookup tables, and digital interpolation to create a one-of-a-kind voltage source. Upon each successive clock pulse, coin toss seeds all outputs with new randomly chosen values.

Freeze stops everything in its tracks and holds each output at its current state. After countless hours, Chance will continue to surprise with new, unbelievable improvisations.

• Chance operations in Eurorack
• Four random voltage outputs with attenuverters
• Unique voltage generation algorithms
• Erratic gate burst and autonomous rhythm trigger outputs
• Freeze control stops everything in its tracks
• Coin toss random voltage reseed
• Digital noise and analog white noise outputs
• Steady master clock output with rate CV

Table of Contents

Installation/Specifications

4

Chance ____ 5

General Functions Overview 6

Installation

To install, locate 14 HP of space in your Eurorack case and confirm the positive 12 volts and negative 12 volts sides of the power distribution lines. Plug the connector into the power distribution board of your case, keeping in mind that the red band corresponds to negative 12 volts. In most systems, the negative 12 volt supply line is at the bottom. The power cable should be connected to the Chance with the red band facing the bottom of the module.

Specifications

Format: 14 HP Eurorack module

Depth: 34mm (Skiff Friendly)

Max Current: +12V = 45mA

-12V = 17mA

1. Smooth Output:

The Smooth Output emits a continuously changing random voltage based on a rate and a destination.

The voltage moves toward the destination at a rate specified by the Rate Knob and the Rate CV input.

Upon reaching the destination, receiving a new clock pulse, or if the Coin Toss Button is pressed, a new random destination will be seeded and the voltage will begin to move toward the new destination.

It is important to note that if Chance is externally clocked, the rate at which the voltage moves to its next destination is set by the Rate knob and the Rate CV input.

Range: ±8V

2. Smooth Attenuverter:

Attenuation and inversion control of the Smooth Output.

If the knob is far left, voltage will have an output range of 0V to -8V. If the knob is far right, voltage will have an output range of 0V to +8V.

3. Discrete Output:

The Discrete Output emits a new steady voltage when a clock pulse is received or if the Coin Toss Button is pressed.

Range: ±8V

4. Discrete Attenuverter:

Attenuation and inversion control of the Discrete Output.

If the knob is far left, voltage will have an output range of 0V to -8V. If the knob is far right, voltage will have an output range of 0V to +8V.

5. Wavetable Output:

The Wavetable Output emits a continuously changing tempo-synced LFO.

If a clock pulse is received or if the Coin Toss Button is pressed, a new random wavetable and division or multiplication of the clock rate is selected.

If a division is selected, the algorithm waits for the number of clock pulses equaling the factor of the division before selecting new values.

Wavetables are as follows:

• Cosine
• Triangle
• Saw
• Ramp
• Stepped Triangle
• Inverted Cosine
• Inverted Triangle
• Inverted Stepped Triangle

Rhythmic Division/Multiplication values are as follows:

• /4 (whole notes)
• /2 (1/2 notes)
- = (1/4 notes)
• *2 (1/8 notes)
• *4 (1/16 notes)

Range: ±8V

6. Wavetable Attenuverter:

Attenuation and inversion control of the Wavetable Output.

If the knob is far left, voltage will have an output range of 0V to -8V. If the knob is far right, voltage will have an output range of 0V to +8V.

7. Blend Output:

The Blend Output allows for smooth morphing between the Smooth, Discrete, and Wavetable algorithms.

The fourth algorithm is an automated distribution of the three other algorithms.

If a clock pulse is received or if the Coin Toss Button is pressed, all algorithms are reseeded, and a new weighted average of all three algorithms is calculated.

It is important to note that the voltage present at the Blend Output will never be identical to the voltage present at the Smooth, Discrete, or Wavetable Outputs, regardless of the Blend Knob setting.

Range: ±8V

8. Blend Attenuverter:

Attenuation and inversion control of the Blend Output.

If the knob is far left, voltage will have an output range of 0V to -8V. If the knob is far right, voltage will have an output range of 0V to +8V.

9. Blend Indicators:

LED indication of the of the currently selected algorithm emitting from the Blend Output.

The LEDs are arranged in the same order as the four algorithms

• If the first LED is illuminated, the Smooth algorithm will be selected
• If the first and second LEDs are illuminated, a blend of the Smooth and Discrete algorithms will be selected
  • If the second LED is illuminated, the Discrete algorithm will be selected
• If the second and third LEDs are illuminated, a blend of the Discrete and Wave table algorithms will be selected
  • If the third LED is illuminated, the Wavetable algorithm will be selected
• If the third and fourth LEDs are illuminated, a blend of the Wavetable and Blend algorithms will be selected
  • If the fourth LED is illuminated, the Blend algorithm will be selected

10. Blend Knob

Controls the amount of blend between the four algorithms emitted from the Blend Output.

If the knob is far left, the first LED will be illuminated and the Smooth algorithm will be selected.

If the knob is far right, the fourth LED will be illuminated and the Blend algorithm will be selected.

11. Blend CV:

Control voltage input for the amount of blend between algorithms.

Range: ±5V

12. Coin Toss Button:

Button that, when pressed, will reseed random values for the Smooth, Discrete, Wavetable, Blend, Burst, Digital Noise and Rhythm Outputs.

It is important to note that pressing the Coin Toss Button will only cause gate signals to emit from the clock output while Freeze is enabled.

13. Rate Knob:

Sets the rate of the internal clock, the rate at which the Smooth algorithm changes, and the rate and density of the gate signals present at the Burst Output.

If the knob is far left, the rate of the internal clock will be as slow as possible.

If the knob is far right, the rate of the internal clock will be as fast as possible.

If the knob is far left, the rate at which the Smooth algorithm changes will be as slow as possible.

If the knob is far right, the rate at which the Smooth algorithm changes will be as fast as possible.

If the knob is far left, the rate and density of the gate signals present at the Burst Output will be as slow and sparse as possible.

If the knob is far right, the rate and density of the gate signals present at the Burst Output will be as fast and condensed as possible.

The internal clock rate has a range of 15 seconds between pulses to 50Hz.

14: Rate CV:

Control voltage input for the rate of the internal clock.

Range: ±5V

15. Clock Input:

External Clock Input.

16: Clock Output:

Output that emits a 50% duty cycle clock signal.

Range: 0V – 5V

17: Burst Output:

At every clock pulse or if the Coin Toss Button is pressed, a gate burst is generated with a random number of gate signals, a random number of rests between gate signals, and random duty cycles for each successive gate signal.

The rate and density of the bursts is determined by the position of the Rate Knob and the voltage present at the Rate CV input.

Range: 0V – 5V

18: White Noise Output:

Analog white noise output.

19. Digital Noise Output:

The digital noise is generated by a series of multiplied digital square waves at random frequencies.

The frequencies of the square waves are reseeded at every clock pulse or if the Coin Toss Button is pressed, allowing it to be a forever-changing noise source.

It is important to note that the position of the Blend Knob, and the voltage present at the Blend CV input have a subtle timbral effect on the sound of the digital noise.

20: Freeze Button:

Button that, when pressed, will freeze the voltage values present at the Smooth, Discrete, Wavetable, Blend, Burst, Digital Noise and Rhythm Outputs.

If the button is illuminated, Freeze is enabled. If the button is unilluminated, Freeze is disabled.

When frozen, the voltage present at the Smooth Output will continue to move to its destination until it arrives, at which point it will wait for the Coin Toss Button to be pressed or to be unfrozen before seeding a new destination.

When frozen, the voltage present at the Discrete Output will immediately stop updating. Pressing the Coin Toss Button will select a new discrete voltage.

When frozen, the currently selected wavetable present at the Wavetable Output continues to run at the clock rate that was last chosen before being frozen. Pressing the Coin Toss Button will select a new random wavetable and rhythmic division or multiplication.

When frozen, the voltage present at the Blend Output adopts the behaviors of the three previously mentioned algorithms based on the currently selected Blend setting.

When frozen, the clock source does not pass to the Clock Output. Instead, pressing the Coin Toss Button will emit a 20ms gate signal from the Clock Output.

When frozen, the Burst Output will continue to output triggers until it has either reached the end of its burst stream or has been reseeded.

When frozen, only the Coin Toss Button will reseed the frequencies of the digital noise.

When frozen, clock inputs are ignored and the Rhythm Output continues to function at the last selected division or multiplication before freezing. If a multiplication was randomly selected, it will continue to repeat until the Coin Toss Button is pressed or Freeze is disabled. If a division is selected, one trigger will emit until the number of reseeds equaling the factor of the division has been received.

21. Freeze Input:

Gate input for Freeze.

22. Rhythm Knob:

Sets the probability of random rhythmic division/multiplication values.

If the knob is far left, the probability for change is as low as possible and set to divide the clock rate by 4.

If the knob is far right, the probability of change is as high as possible and set to both divide and multiply.

Rhythmic Division/Multiplication values are as follows:

• /4 (whole notes)
• /2 (1/2 notes)
- = (1/4 notes)
• *2 (1/8 notes)
• *4 (1/16 notes)
• *8 (1/32 notes)
• *3 (1/8 note triplets)
• *6 (1/16 note triplets)

23. Rhythm CV:

Control voltage input for Rhythm.

Range: ±5V

24: Rhythm Output:

Random rhythmic division/multiplication output.

At every clock pulse (or multiple of clock pulses in the case of divisions) a new random division or multiplication will be selected and emitted as a 5ms trigger signal.

Range: 0V - 5V