Contour is a 4 Stage function generator, or ADSR, derived from our 0-COAST synthesizer. It is designed to create control voltages to drive the Dynamix, modDemix and other fast VCAs, VCFs, and more. The Contour takes inspiration from the original Loudness Contour circuit of the MiniMoog, which is perhaps the most well-known example of East Coast Synthesis. The simplified control set (where Decay adjust both the decay to Sustain and the Release) makes it quick and intuitive to set-up. The Contour module adds full voltage control, a mirrored output, End of Onset and End of Contour Gate outputs which allow it to be highly integrated into any modular synthesizer regardless of coastal allegiance.
The core of the Envelope Generator is borrowed from famous Russian synth Polivoks, but significantly updated schematics – eurorack standard positive gates, envelope amplitude, inverted envelope output, looping feature (looping on gate on). Bonus feature Gate Delay – the module outputs delayed gate signal after Attack stage. Chain up several (4-5) Envelope Generators, each with delayed gate to create evolving polyphonic synth-like pads!
Polivoks VCF is famous for its’ crazy resonance sweeps and deep, bassy sound which makes it ideal for acid basslines.
We believe, this is one of most is one of most authentic sounding famous Russian synth Polivoks VCF emulations available. The original Russian ICs K140UD12 are used in the sound circuit. We did several updates to adapt the VCF for contemporary modular synth demands. Independently buffered inputs, extended Cutoff knob range, eliminated clicks, when switching filter modes, and output stage added to eliminate signal inversion.
The circuit is based in part on the Roland SH-101 / System100m design with several enhancements.
Manual GATE buttons
Three timing ranges: (1 second, 10second, 1minute A/D times)
Normal and inverted outputs
End of Decay (EOD) logic output
Cycle mode (which GATE logic control)
Retrig input (allows re-triggering of the envelope if source gate held high)
Dynamic control of the envelope output level (each ADSR is routed through a linear VCA and the control is normalled to +5V via the LEVEL jack. You can patch another control source like an LFO or VELOCITY level from a keyboard to this jack.
Use Fusion Mixer as two independent 3-input mixers (also for stereo signal mixing) or 6-input mixer. Special feature of the Fusion Mixer – great tube overdrive effects when level knobs are set to 3 o’clock and above. When used with drum machines, it even emulates side chain compressors. When used to mix signals from VCOs Fusion Mixer works as wave shaper, especially, if pulse width modulated pulse signals is used in one of inputs.
All Fusion modules by default are configured to work with regular eurorack PSU.
6 audio inputs
Two independent 3-input mixer
Sum of all 6-inputs
Soft tube overdrive
Configurable power supply – standard Eurorack +-12V connection OR Eurorack +-12V plus Erica Synths Tube heater PSU