ADDAC System ADDAC507 Random Bezier Waves User Guide
- June 1, 2024
- ADDAC System
Table of Contents
ADDAC System ADDAC507 Random Bezier Waves
Specifications
- Width: 10HP
- Depth: 4.5cm
- Power Consumption: 70mA +12V, 40mA -12V
Product Information
Controls Description
[FREQUENCY] sets the cycle/interval time between random steps. A new random
voltage is generated at every cycle, interpolating from the current value to
the newly generated value during the cycle time.
Outputs Description
- [AB AVERAGE] & [INVERTED AVERAGE]: Average and inverted average of channel A & B: (A+B)/2
- [WAVE]: The wave CV output
- [INVERTED WAVE]: The wave inverted CV output
Gate Output
There are two [GATE] output behaviors depending on the channel:
- CHANNEL A – CLOCK OUTPUT: Outputs a 15ms trigger at every new cycle.
- CHANNEL B – COMPARATOR OUTPUT: The gate output is ON when the voltage output is above its mid-range position.
Curve Shapes Over Time
Examples of curve shapes over time with control knob positioned at fully
counter-clockwise, noon, and fully clockwise. Also shows the inverted wave
output.
Product Usage Instructions
Cross Patching
Channel 2 output can be connected to Channel 1 output for the following
parameters:
- FREQUENCY A LEVEL A
- FREQUENCY B LEVEL B
Signal Flow Diagram
Detailed signal flow diagram showcasing the connections and interactions
within the ADDAC system for optimal performance.
FAQ
-
Q: How do I adjust the frequency settings?
A: Use the [FREQUENCY] control knob to set the cycle/interval time between random steps. -
Q: What do the gate outputs indicate?
A: The gate outputs differ based on the channel – Channel A provides clock output triggering at each cycle, while Channel B offers comparator output based on voltage levels. -
Q: How can I monitor the voltage and gate outputs?
A: The LEDs on top of the device monitor each channel’s voltage and gate outputs for easy visualization. -
Q: Can I connect Channel 2 output to Channel 1 output?
A: Yes, you can cross-patch Channel 2 output to Channel 1 output for specific parameters like frequency and level adjustments.
WELCOME
This module started with an idea from Rijnder Kamerbeek aka Monotrail, a straightforward random generator with interpolation between random points making it something like a complex, ever evolving, LFO The concept is simple. It contains two identical smooth random voltage generators. Each has a frequency, level, offset and curve control. The frequency control sets a steady pace with which bipolar random voltages are generated. The level control works like an attenuator/VCA on the output, reaching from max output to closed. The offset allows shifting the whole wave up and down on the voltage range. Curve determines the shape of the interpolation.The bipolar activity on the main outputs as well as gate outputs are visualised with LEDs. Both Frequency and Level controls have a CV input with attenuator. When there is nothing patched into the CV inputs, these are internally connected to the main output of the other channel. This normalization makes it very easy to add randomization to the frequency or level for more depth, or of course, add cross-modulation for chaotic voltages. The output VCAs are usefull to dial in subtle and time-based modulation without the need for external VCAs. For example, to modulate the amount over time with an envelope, or use the other generator with slower speeds to add random changes to the level of a random voltage. Both generators also have two other outputs. One is an exact inversion of the main output, so it responds to the level and CV input. This is great for stereo or inversed effect patches. The other is a simple pulse output, here there are two different behaviours, channel A outputs a pulse at every random generation, channel B acts like a comparator. Whenever the main is positive this comparator output is a high gate. And whenever the main output is negative or close to 0, there is no gate output. Great for random triggers or firing other events like envelopes. A couple other outputs are also available and are obtained by averaging both channel main outputs. The first output is the average while the second is an inverted average.
Tech Specs:
- 10HP
- 4.5cm deep
- 70mA +12V
- 40mA -12V
CONTROLS DESCRIPTION
OUTPUTS DESCRIPTION
GATE OUTPUT
BÉZIER INTERPOLATION
As described in wikipedia “Bézier curves are widely used in computer graphics to model smooth curves. As the curve is completely contained in the convex hull of its control points, the points can be graphically displayed and used to manipulate the curve intuitively” Here we take advantage of these control points to interpolate between the 2 random points, we approach the control points in a very controlled manner: they move vertically when the control knob turned counter clockwise (up to half the diference of the 2 random points) and move horizontally when turned clockwise (up to half of the cycle period). At noon the interpolation is linear. The graphics on the right show examples of these principles with control points in red. Shown below are three examples of the curve shapes over time, these are 3 particular cases with control knob positioned at: fully counter clockwise, noon and fully clockwise. Also shown the inverted wave output.
CROSS PATCHING
SIGNAL FLOW DIAGRAM
For feedback, comments or problems please contact us at: [email protected]