Befaco Voltio
Precision manual voltage source for tuning and transposition
6 HP Eurorack module
Voltio is an accurate manual voltage source designed for both musical and technical applications, generating precise voltages calibrated to the 1V/octave standard across the chromatic scale. It serves as an oscillator tuning tool, musical transposer, and calibration instrument for DIY and analog gear maintenance, combining an octave knob, semitone knob, and precision summing input.
Features
- Octave control generating 1V per step increments calibrated to 1V/octave standard
- Semitone control generating 83.3mV per step for chromatic scale intervals
- Range switch selecting unipolar (0V to +10V) or bipolar (-5V to +5V) operation
- Precision summing input (SUM IN) for offsetting output or transposing incoming CV
- 2mm banana connector outputs for direct multimeter probing during calibration
- All-analog signal path
- Covers full 12-tone equal temperament chromatic scale
- Performs best after 30 minutes of warmup
- Useful for VCO and filter calibration on DIY projects
Controls & Jacks (9)
- Semitone Control — Generate increments of 83.3 millivolts per step (one semitone) while moving clockwise, or decrements while moving counterclockwise.
- Octave Control — Generate increments of one volt per step (one octave) while moving clockwise, or decrements while moving counterclockwise. Range depends on
- Main OUT — Main voltage output of the module.
- Multimeter GND — 2mm banana connector for multimeter probe ground connection. Both probe connectors must be connected for proper multimeter operation.
- SUM IN — Precision summing input that adds any incoming signal to the voltage produced by the module. Useful for offsetting the output or transposing
- Multimeter OUT — 2mm banana connector for multimeter probe connection. Copies the Main OUT signal.
- Range — Select the range of the octave control from positive (0V to 10V) at bottom position or bipolar (-5V to +5V) at top position. With bipolar ra
- Multimeter Probe OUT — 2mm banana connector for multimeter probe connection. Copies the Main OUT signal.
- Multimeter Probe GND — 2mm banana connector for multimeter probe ground connection. Both probe connectors must be connected for proper multimeter operation.
How-To Guides
- Tune an Oscillator to a Known Pitch
- Transpose a Sequence Up One Octave
- Transpose a Sequence Down One Octave
- Offset a Melody by a Chromatic Interval
- Calibrate a VCO Using Multimeter Probes
- Generate a Fixed Root Note Drone
- Manual Pitch Bend via Semitone Steps
- Harmonize Two Oscillators at a Fixed Interval
- Offset Filter Cutoff by Known Intervals
- Bipolar Offset for Modulation Centering
Explore the interactive Voltio panel on BleepDex — tap any control to learn what it does.
