Larix Elektro - Dual Undula Oscillator

The Dual Undula Oscillator from French maker Larix Elektro is an analog complex oscillator built around two sine-core VCOs, two wavefolders, two bipolar VCAs, an LFO, and an AD envelope. That's plenty of architecture for one module! The interesting part here is that each oscillator is essentially also a controlled feedback loop — closely related to a filter circuit. Dial back the oscillation and the VCO becomes a resonant filter that accepts external audio. Dial it forward and the sine saturates into something thicker. This dual nature runs through the whole design. The bipolar VCAs double as low-resolution ring modulators, and a front-panel switch flips them into a Mid-Side stereo processor. Everything is internally normaled but still fully patchable, so you can use it as a self-contained voice or spread its functions across a larger system.

The module is also deliberately DIY-friendly. Rear jumpers, PCB access points, and through-hole capacitors invite you to reconfigure signal routing, swap component values, or expand I/O with Larix Elektro's companion modules. Raw, deep, open-ended — a proper analog toolkit for those who appreciate circuits that blur the line between oscillator and filter; very interesting stuff!

Features:

• 2 sine-core analog VCOs (5Hz–12kHz), usable as resonant filters
• Sine or square waveform selectable per oscillator
• 1V/Oct input normaled between both VCOs
• Exponential FM input with attenuator per VCO
• CV-controllable oscillation/resonance (Q) per VCO
• Audio input per VCO for filter operation
• 2 wavefolders with dedicated VCA for CV-controllable fold intensity
• External audio input per wavefolder
• 2 bipolar VCAs (low-resolution ring modulator behavior)
• Switchable bipolar/unipolar VCA mode via rear jumpers
• L-R / Mid-Side processing mode (front-panel switch)
• LFO with triangle and square outputs
• AD envelope with trigger input (normaled to LFO square)
• Multiple PCB access points for routing modifications and expanded I/O
• PWM and CV Q accessible via rear pin headers
• Compatible with Larix Elektro Attv-4 and Mult. expander modules
• DIY-friendly through-hole capacitors for LFO, envelope, and VCO range modification