Lab Seven modules for VCV Rack
All modules are available for free and open source*. If you like them,
please consider making a donation. Any amount is welcome. Thanks!
*licensed under Creative Commons Attribution-NonCommercial-ShareAlike 4.0
International Public License, see CC website and LICENSE.txt
3340 series modules
MK1/2 modules -
Algorithm modules -
The first Lab Seven module: An extended version of a classical VCO from a well-known 80s synthesizer. Comes with standard blue and 'classic gray' skins (simply rename svg files to change skins).
User interface features
- RANGE knob: Selects the pitch of the entire VCO in octave steps
- RANGE Input: Extends the range of the knob by +- 3 octaves from 128' to an upper limit of 0.5'.
- -3V: -3 octaves
- -2V: -2 octaves
- -1V: -1 octave
- 0V: No change
- +1V: +1 octave
- +2V: +2 octaves
- +3V: +3 octaves
- Comment: The idea is to equip another module with a (-3, -2, L, M, H, +2, +3) switch or modulate the range input for arpeggiator-like effects.
- Comment: Maximum pitch is limited to 45% of the current sample rate (example: 44.1kHz -> 19,8kHz) with a hard threshold of 40kHz.
- MOD fader: Selects the amount of pitch modulation.
- MOD Input: +- 5V -> +- 2.25 octaves of pitch modulation (like the original synth)
- V/OCT: Determines the pitch of the note to be played.
- PWM (pulse width modulation of the square waveform)
- PULSE WIDTH fader: Scales the amount of PWM. The effect depends on the selected PWM source.
- PULSE WIDTH selection
- LFO: Input +- 5V -> 10% to 90% pulse width
- MAN: Manually sets pulse width, ranging from 50% to 90%
- ENV: Input 0V to +10V -> 50% to 90% pulse width
- Source mixer
- Waveforms: Square (with PWM), sawtooth, triangle, sub oscillator (3 modes), coloured noise
- Individual waveform outputs are unattenuated. Faders only affect the MIX output.
- SUB OSC mode selection (SEL) input options
- 0V: Manual selection
- +1V: 1OCT DOWN
- +2V: 2OCT DOWN
- +3V: 2OCT DOWN with 25% pulse
Algorithmic (internal) features
- Internal resolution: 192kHz
- VCO algorithm: BLIT (band limited impulse train) + leaky integrator
- Impulse: Original 3340 impulse reconstructed by Blackman-Harris kernel + leaky integration
- Coloured noise: High quality sample loop @192kHz
- Resampling/anti-aliasing: Windowed sinc interpolation