Cre8audio East Beast Manual de usuario

East Beast

User Guide

v1.0

Thank you for purchasing the Cre8audio East Beast. Your investment in our ideas help

support innovative synthesizer design!

Good analog sounds better. Good analog adds a dimension to a sound that can be felt

as much as heard, but good analog does not have to be complex. A single analog

oscillator full of depth and character passing through a warm, sweet lter can be all it

takes to get you there. The East Beast is a a direct path to that sound.

I love the East Beast for how immediate it is and how it welcomes both new and veteran

artists to modular analog synthesis with a sense of humor and without pretense. Please use

this synthesizer as a launch pad for experimentation and fun in the search for your sound

because that’s exactly what we at Pittsburgh, and our friends at Cre8audio designed it for.

Analog is important,

Richard Nicol

Founder | Product Designer

Pittsburgh Modular Synthesizers

Thank You!

East Beast

Read Instru tions:

Please read the Cre8audio East Beast Synthesizer User Guide completely before use and

retain for future reference.

• Only use the DC power adapter provided by Cre8audio with the East Beast. Using an

incorrect power adapter can cause permanent damage to the East Beast and the

power adapter.

• The East Beast is an electronic device. Exposure to water will cause the East Beast

circuitry to short circuit and may cause permanent damage.

• Do not attempt to modify the East Beast. Tampering with the circuitry may cause

permanent damage.

• Do not place heavy objects on the East Beast. The user interface is mounted on a PCB

that can be damaged if stressed by excessive weight.

• Do not attempt to repair the East Beast. Please contact Cre8audio regarding

malfunctions of any kind.

• Cre8audio is not responsible for any damage or loss caused by improper use of the

East Beast.

• Do not taunt the East Beast.

IMPORTANT Eurora k Ribbon Cable Power Information:

The Cre8audio East Beast Synthesizer is a Eurorack format synthesizer module. The module

can be installed, rearranged, removed, and replaced in any compatible Eurorack case

from Cre8audio, Pittsburgh Modular, or other manufacturers.

The Cre8audio East Beast Synthesizer uses a standard 16 pin Eurorack ribbon cable to

connect the module to a bipolar +/-12v power supply. Please pay very close attention to

the orientation of the ribbon cable when adding and removing modules. The stripe on the

ribbon cable marks -12 volt power. This stripe needs to line up with the -12 volt pins on the

power supply and the -12 volt pins on the module. The Cre8audio East Beast Synthesizer

includes reverse polarity protection so it will not be damaged when plugged in incorrectly;

however, as a general rule, failure to match up the pins correctly can result in damage to

one or all the modules in a case. On Cre8audio and Pittsburgh Modular cases the positive

and negative voltages are clearly labeled. On the

Cre8audio East Beast Synthesizer module, the power header is clearly labeled and keyed

to ensure a safe and proper connection.

Do NOT remove the Cre8audio East Beast Synthesizer module from any case while it is

plugged in.

Do NOT unplug power ribbon cables from the Cre8audio East Beast Synthesizer or case

while the case is plugged in.

1.1 Important Power Information

East Beast

1. Osc. Fine Tune Knob

2. Osc. Pitch Glide Knob

3. Osc. FM Knob

4. Osc. Pulse Width Knob

5. Osc. Sine LED

6. Osc. Triangle LED

7. Osc. Saw LED

8. Osc. Pulse LED

9. Filter Cutoff Knob

10. Filter Low Pass LED

11. Filter Band Pass LED

12. Filter High Pass LED

13. Filter Cutoff Mod Knob

14. Filter Resonance Knob

15. Envelope Attack Knob

16. Envelope Decay Knob

17. Envelope LED

18. Envelope Sustain Knob

19. Envelope Release Knob

20. Display Clock LED

21. Display Hold LED

22. Display Random LED

23. Display Sequence LED

24. Volume Knob

25. LFO LED

26. LFO Rate Knob

27. Osc. Pitch In Jack

28. Osc. FM In Jack

29. Osc. Pulse Width In Jack

30. Filter Mod In Jack

31. Filter Audio In Jack

32. MIDI In Jack

33. Clock In Jack

34. Envelope In Jack

35. VCA Audio In Jack

36. VCA Mod In Jack

37. MIDI Out Jack

38. Clock Out Jack

39. MIDI Pitch Out Jack

40. MIDI Gate Out Jack

41. Multi-Tool Out Jack

42. Main Output Jack

43. Envelope Out Jack

44. Filter Out Jack

45. Osc. Out Jack

46. LFO Out Jack

47. Tap Clock (blue) Button

48. Edit (green) Button

49. Octave Up Button

50. Octave Down Button

51. C1 Note Button

52. C# Note Button

53. D Note Button

54. D# Note Button

55. E Note Button

56. F Note Button

57. F# Note Button

58. G Note Button

59. G# Note Button

60. A Note Button

61. A# Note Button

62. B Note Button

63. C2 Note Button

2 User Interfa e

3 4

10 11 12

20 23

2221

15 16

18 19

567

os illator

pgh ﬁlter

envelope

volume

lfo

50 51 53 55 56 58 60 62 63

52 54 57 59 61

East Beast

3.1 Overview:

The Cre8audio East Beast Synthesizer combines the functionality of 6 individual modular

synthesizer modules behind a single panel. Connect different functions using patch cables

to create complex sounds and textures.

The East Beast signal path is divided into two types of signals: audio signals and control

voltages. The audio signal is the sound that is produced. The audio signal path starts at an

oscillator or other sound source. The audio signal is then patched through other functions

used to shape the sound such a lter or VCA.

Control voltages (CV) manipulate the audio signal in several different ways. Gates are

represented by a high (5 volts) or low (0 volts) control voltage. A gate can be generated

using a pulse or square wave from an oscillator or modulation source, or by using the MIDI

gate or clock output. A gate can be shaped using the Envelope to control the attack,

decay, sustain, and release of the gate. The modied gate signal can then be sent to any

Modulation CV input on the East Beast.

A second use for control voltages is as a modulation source. For example, a control

voltage from the MIDI pitch output patched into the Filter Mod input on the lter module

controls the cutoff frequency of the lter based on the midi note received. The LFO

provides a separate low frequency oscillator that makes a perfect control voltage modu-

lation source. Audio rate modulation signals also make a great CV source for oscillator FM

(frequency modulation).

Any output can be patched into any input. Some patching may not result in musical or

interesting results but experimentation with the patch points is always encouraged.

3.2 Panel Labeling Conventions:

The Cre8audio East Beast uses several simple labeling conventions to make the user

interface and signal ow easy to understand.

• Each main function is contained within a white outline.

• Input jacks are labeled with blue.

• Output jacks are labeled with white.

• Green functions are accessed by holding down the [Edit (Green) Button].

• Blue functions are accessed by holding down the [Tap Clock (Blue) Button].

3.3 Manual Labeling Conventions:

Within the manual, user interface buttons, knobs, and jacks are in bold and marked with

brackets [ ]. For example, [Clock LED] refers the the LED labeled clock in the display

section.

The East Beast uses a simple 4-bit display to visualized selected modes. The 4-bit display is

shown in the manual with a graphic showing a set of 4 LED status indicators.represents

a lit LED. represents an unlit led.

3 East Beast Overview

East Beast

3.4 Internal Pat hing:

The East Beast utilizes internal patching to create a single oscillator synth voice that does

not require patch cables to play. To modify the internal patch or to create something

completely new, all of the internal routing can be bypassed using patch cables. This allows

total patching freedom without the constrains of a xed voice architecture.

Plugging a patch cable into an internally patched input jack will override any internal

patching. Most internal connections are made using switched jacks. A switched jack

allows the internal signal path to be disabled when a patch cable is inserted. A simple

example would be the pitch input of the oscillator. Internally, the pitch output of the midi

section is wired to the switched jack input of the oscillator. When a patch cable is plugged

into the pitch input of the oscillator, that patch cable breaks the connection to the midi

pitch output and replaces it with the signal from the inserted patch cable.

3.5 Internal Pat hing Diagram:

The diagram below shows the pre-patched audio and CV signals. Each signal is patched

with a unique color for clarity.

3 East Beast Overview

East Beast

34 44

3530

4 Individual Modules

East Beast

4.1 Panel Layout:

The East Beast can be organized into 6 independent Modules. Oscillator, lter, envelope,

VCA, LFO, and button keyboard. Each module controls one or more functions and can

operate on its own or can be patched into any other module within the East Beast or other

Eurorack format modules.

5.1 Os illator Overview:

The Oscillator is a wide range, fully analog, VCA saw core waveform generator designed

by Pittsburgh Modular. Linear frequency modulation (FM) ranging from subtle to extreme is

available using the [Osc. FM In Jack] and [Osc. FM Knob]. Linear FM modulation the

frequency of the oscillator equally in both positive and negative directions. This allows for a

larger range of frequency modulation before losing pitch tracking. Custom internal wave

shaping provides a selection of four geometric waveforms (sine, triangle, saw, and pulse)

along with pitched noise. Select a waveform using [Green Edit Mode : Note Button C1].

Select a random waveform for each note using [Blue Edit Mode : Note Button C1].

The pulse wave can be modulated using the [Osc. Pulse Width In Jack] and [Osc. Pulse

Width Knob]. The width of the pulse wave is modulated from 50% with no modulation to 1%

with full modulation. The [Osc. Pulse Width Knob] manually sets the pulse width when no

modulation source is present.

Combination waves are available that mix two waveforms to create different shapes.

Please note, these waveforms have a larger amplitude than the individual waveforms and

may cause overdrive in the lter and/or VCA. Pitched noise is generated by randomly

switching between the four geometric waveforms rapidly. A perfect choice for percussive

sounds.

5.2 Os illator Controls, Inputs, and Outputs:

[Osc. Fine Tune Knob] - Fine tune frequency control. Used to tune the oscillator to a precise

frequency with a range of +/- 1.5 semitones.

[Osc. Pitch In Jack] - One volt per octave pitch tracking input. Used to control the pitch of

the oscillator with a keyboard controller, sequencer, or other calibrated voltage source.

[Osc. Pitch Glide Knob] - Portamento control creates smooth transitions between notes.

Turning the knob to the right increases the length of time it takes to glide from one note to

another.

[Osc. FM In Jack] - Linear FM input jack used for frequency modulation.

[Osc. FM Knob] - FM input level control sets the amount of signal allowed to pass from the

FM input to the oscillator core.

[Osc. Pulse Width In Jack] - Pulse width modulation input. Controls the width of the pulse

wave from 50% (Square Wave) to 0% (positive CV) or 100% (negative CV).

[Osc. Pulse Width Knob] - Dual function knob. When nothing is patched into the [Osc. Pulse

Width In Jack], the knob manually controls the width of the pulse wave from 50% to 1%. If a

cable is patched into the [Osc. Pulse Width In Jack], the knob sets the amount of signal

allowed to pass from the pulse width input to the pulse wave shaper.

[Waveform LEDs] - LEDs show the currently selected waveform(s). Sine, triangle, saw, pulse.

[Osc. Out Jack] - Outputs selected waveform(s).

5 Os illator Module

East Beast

6.1 PGH Filter Overview:

The PGH Filter module is a voltage controlled, analog, state variable lter. State variable

topology offers several lter output responses, highpass, lowpass, and bandpass. Select a

lter response using [Green Edit Mode : Note Button C#]. Select a random response for

each note using [Blue Edit Mode : Note Button C#]. Each response produces a very smooth

and natural sounding sweep. The lter has dened sound of Pittsburgh Modular from the

moment it was introduced. A distinct sound that has been tweaked to perfection. It offers

a warm, organic sweep through the full frequency range. The lowpass lter is gummy and

relaxed while the highpass is clean and dened. The goal was to produce a lter that did

not have a sweet spot; where the every turn of the frequency knob produced something

interesting.

6.2 Filter Controls, Inputs, and Outputs:

[Filter Cutoff Knob] - Filter cutoff frequency control knob.

[Filter Mode LEDs] - LEDs show the currently selected lter response(s).

[Filter Mod In Jack] - Cutoff frequency modulation CV input jack.

[Filter Cutoff Mod Knob] - Cutoff frequency CV input level control. When using lter modu-

lation, the [Filter Cutoff Knob] becomes the offset control and the [Filter Cutoff Mod Knob]

sets the amount of CV manipulating the lter cutoff.

[Filter Resonance Knob] - Resonance control knob. Increasing the Resonance (or Quality

Factor) Amplies a Narrow Band of Frequencies around the Filter Cutoff Frequency. State

Variable Filter Topology Allows for Near Innite Resonance Without Falling Into Self-

Oscillation.

[Filter In Jack] - Filter audio input jack

[Filter Out Jack] - Filter audio output jack

6 PGH Filter Module

East Beast

7.1 Envelope Overview:

The Envelope module is a four stage ADSR envelope generator that smooths the shape of

the incoming gates and triggers to produce a more expressive instrument. The Envelope

output can be used to control the amplitude of an oscillator, the cutoff frequency of a

lter or any other function on a module that accepts control voltages.

The Envelope is designed to be snappy and percussive. Small adjustments to the [Attack

Knob] will reduce this effect and smooth out the sharp attack.

The incoming gate or trigger signal passes through each of the four stages to output an

envelope. When the ADSR module receives a gate or trigger signal, the attack determines

the amount of time needed for the envelope generator to reach the peak output voltage

and move on to the decay stage. Decay sets the amount of time needed to transition to

the level set by the sustain knob. The sustain level is maintained as long as the incoming

gate remains on or high. Once the incoming gate goes low or off, the release knob sets

the time needed to close the envelope and return the Envelope output to 0 volts.

Envelope outputs 0-10 volts.

7.2 Envelope Controls, Inputs, and Outputs:

[Attack Knob] - Envelope attack time control. Sets the amount of time needed for the

envelope output to reach the maximum level.

[Decay Knob] - Decay time control. Sets the amount of time needed for the envelope

output level to transition to the selected sustain level after the attack stage has

completed.

[Sustain Knob] - Sustain level control. Sets the voltage level of the envelope once the

decay stage has completed. Sustain is active until the [Envelope In Jack] signal turns off.

[Release Knob] - Release time control. Sets the amount of time needed for the envelope

output level to return to zero once the [Envelope In Jack] turns off.

[Envelope In Jack] - Envelope gate input jack

[Envelope Out Jack] - Envelope CV output jack

7 Envelope Module

East Beast

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