RAVEN — an overview

RAVEN — 100% Analog. Modular Voice.

RAVEN's system-architectural idea was about going back to the basics of subtractive synthesis.
We wanted to capture the raw, non-linearity, and honesty of a 100% analog circuit.
The main engineering challenge of RAVEN was consolidating a highly complex conglomerate of modular, discrete designs into a slim 3U/42HP (Eurorack) form-factor resulting in a uniquely sounding subtractive,
modular, high-performance, musical instrument.

RAVEN is comprised of:

• Dual, wide-range Voltage Controlled Oscillators (C1-C9), unison trackable with extensive FM/AM/PWM possibilities.
• Dual, wide-range Low-Frequency Oscillator (ca. 0.1Hz - Audio) switchable mode.
• A high-headroom, Voltage Controlled Crossfader (A/B).
• The original TheBateleur (Ⓡ pending) Voltage Controlled Filter.
• Two Voltage Controlled Amplifier circuits - A high-performance THAT2162 BlackmerⓇ VCA and an Optocoupler VCA reminiscent of legendary West-Coast designs as a serial-saturation option.

RAVEN combines the simplicity of a performance-friendly, semi-modular synthesizer voice with fully modular, infinitely flexible, workflow possibilities by assigning Control Voltage I/O’s at (almost) every point in the signal workflow.
Each modular component can be seen as a standalone, self-sufficient entity.
The normalized VCF can be used as a standalone 24dB LPF or 3rd Oscillator-voice in self-oscillation range, perfectly tracking 1V/Oct by choice.

Technical Specifications

• Reference Overview
• Technical Definitions
• Signal Flow
• Patch Sheet

CV IN

• Pitch VCO I
• FM VCO I / AM VCO I
• PWM VCO I
• Sync VCO I
• Pitch VCO II
• FM VCO II
• PWM VCO II
• Sync VCO II
• VCF Linear modulation
• VCF Exponential modulation
• VCF Resonance modulation
• VCA Linear modulation
• Crossfader modulation

AUDIO OUT

• Triangle VCO I
• Square VCO I
• Saw VCO I
• Sub VCO I
• Triangle VCO II
• Pulse VCO II
• Saw VCO II
• White Noise
• VCF output LPF / Self Resonance
• VCA output, Clean / Opto drive
• Crossfader output

AUDIO IN

• VCF audio input
• VCA audio input
• Crossfader audio Input I
• Crossfader audio Input II

TOGGLES

• VCO I Audio and LFO mode toggle
• VCO II Audio and LFO mode toggle
• VCO I FM / AM circuit mode toggle
• Clean / Opto drive mode toggle

CONTROLS

• Coarse Pitch VCO I
• Fine Pitch VCO I
• Coarse Pitch VCO II
• Fine Pitch VCO II
• Pulse Width VCO II
• PWM CV Amount
• MOD CV Amount
• Filter Input Amount
• VCF CV Amount
• VCF Cutoff frequency
• VCF Resonance
• VCA Gain Control
• Crossfader Control

LED

• VCO I Signal visualisation
• VCO II Signal visualisation

TRIMMER

• VCO I Initial frequency setting
• VCO I Exponential characteristic
• VCO II Initial frequency setting
• VCO II Exponential characteristic
• VCF Initial frequency setting
• VCF Exponential characteristic