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Noise Engineering
Variatic Erumption
Dual-Burst Generator with built-in LFO
Overview
Type
Burst Generator
Size
10HP Eurorack
Depth
.8 Inches
Power
2x5 Eurorack
+12 mA 50
-12 mA
5
Variatic Erumption is a dual-burst generator. When triggered, it produces a
controllable sequence of gates synchronized to a LFO. A 1v/8va LFO is
included. Any external LFO/clock may optionally be used. Bursts can be
terminated early with the choke. Burst length can be controlled as well as the
pattern used for the burst.
1
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Summary of Contents for Noise Engineering Variatic Erumption
- Page 1 2x5 Eurorack +12 mA 50 -12 mA Variatic Erumption is a dual-burst generator. When triggered, it produces a controllable sequence of gates synchronized to a LFO. A 1v/8va LFO is included. Any external LFO/clock may optionally be used. Bursts can be terminated early with the choke.
- Page 2 Noise Engineering Variatic Erumption Dual-Burst Generator with built-in LFO Patch Tutorial Put INT/EXT switch into the INT position. Put FST/SLW switch into the SLW position. Set PAT knob fully CCW. Set le CNT fully CW. Connect the le OUT and END to two gateble modules such as an envelope or Basimilus Iteritas.
- Page 3 Noise Engineering Variatic Erumption Dual-Burst Generator with built-in LFO Interface - LFO Int/Ext is switch selects the burst clock source between the internal LFO or an external clock. In - Jack 0-8v In internal LFO mode this jack is a 1v/8va CV for the internal LFO and has 8 octaves of range.
- Page 4 Noise Engineering Variatic Erumption Dual-Burst Generator with built-in LFO Interface - Burst Hit - Jack is gate input will start the burst on a rising edge. If using internal clock mode, it will also reset the phase of the internal LFO to match the HIT phase.
- Page 5 Dual-Burst Generator with built-in LFO Patterns Variatic Erumption’s patterns are based off of the bit-reversed concatenation of two 16-bit prime numbers. Prime numbers are always odd so in binary the lowest bit is always set. Reversing these will always generate a pattern who’s rst beat is set.
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Page 6: Design Notes
Dual-Burst Generator with built-in LFO Design Notes Variatic Erumption started in Cyrus Makarechian’s lo when Aaron Funk asked me why there was no burst generator in Eurorack. I responded: “What is a burst generator?”. Cyrus sent me some links to existing products and a few days later I had a rudimentary prototype designed and ordered.