Thorn Audio VCLFO

Name: VCLFO
Brand: Thorn Audio

Fully CV-controllable 16-waveform LFO with S/H and VCA

12 HP Eurorack module

The Thorn Audio VCLFO is a fully voltage-controllable, externally syncable, 16-waveform low frequency oscillator built around a programmable PIC microcontroller running Electric Druid firmware. It offers 8 base waveforms (rising ramp, falling ramp, square, triangle, sine, valley, peaks, noise) each with an alternative variant (harmonic additions, quad modes, random glide), all selectable via CV. A built-in sample & hold circuit can be clocked internally or externally via sync, and the Skew control shifts the waveform center point from 12.5% to 87.5% of the cycle. The integrated VCA controls output amplitude from 0V to +-5V. Every parameter has a dedicated CV input, making hands-free modulation of all aspects possible. The processor is socketed for custom firmware.

Features

16 waveforms: 8 primary + 8 alternative variants
Every parameter has dedicated CV input
Built-in voltage-controlled amplifier (VCA)
Built-in sample & hold with internal and external clocking
Waveform Skew control (12.5% to 87.5% cycle shift)
Hard sync input with 4 sync modes (Off/S/H/LFO/Both)
4 octave ranges spanning 0.05Hz to 102.4Hz
Three simultaneous outputs: normal, inverted, and gate
Bicolor output LED (blue/red) for visual feedback
Color-coded jack nuts: gold=gate, black=CV, red=output
Socketed PIC microcontroller for custom firmware
Electric Druid VCLFO10 digital wavetable core

Controls & Jacks (23)

Frequency
Waveform Select
S/H Rate
Skew
Level
Sync Mode
Alt Waveform
Octave Range
Frequency CV In
Octave CV In
S/H Rate CV In
Alt Waveform In
Waveform CV In
Skew CV In
Sync In
Sync Mode CV In
Level CV In
Gate Out
Inverted Out
Out
Sync Indicator
Output Indicator
Gate Indicator

How-To Guides

Voltage-Controlled Tremolo
Stepped Random Voltage
Evolving Complex Modulation
Partial Waveform via Sync

Explore the interactive VCLFO panel on BleepDex — tap any control to learn what it does.