"Unedited recording from the ERD/ERD (Earth Return Distortion) module released 23 September from micro_research. In this recording a sine from RS-95e is passed through earth and modulated in ERD/ERD by a triangle living VCO."
Also see the ERD/SIR further below.
ERD is a new modular maker.
You can swap out the dirt with other compositions!
via
ERD:
"ERD/ERD (Earth Return Distortion) is the first and most extreme expression of the ERD philosophy, seeking to literally put the earth back into circuit with technology. All world electricity travels through the earth and nearly all electronic circuitry and devices are extracted and refined from the earth. ERD/ERD puts a small block of forest earth into the Eurorack circuit, allowing control and audio signals to be distorted and amplified as they pass through the earth block. It can be viewed in conventional terms as an earth conditioned VCA (amplification factor by knob control or CV) and distortion. Local electrical and atmospheric signals can condition and distort the earth signal. Two jack connections are also included, optionally switching out the local earth block in favour of routing through local earth piles and forest sites. Discounts are available in return for earth samples (eg. Edgar Allen Poe earth from Baltimore, vampire earth from Transylvania or Whitby)."
"The ERD modular eurorack series, from the creator of the Black Death and Dark Interpreter noise synth devices,aims to infect and contaminate the world of Eurorack with a radical, new artistic sensibility.
ERD/ERD (Earth Return Distortion) and ERD/SIR (Susceptible, Infected, Recovered) are the first ERD releases of 2015. All ERD modules are supplied fully hand assembled and totally Eurorack compatible (+ and -12v supplies). Each series will be sold in a limited, strictly numbered edition of 40 modules each. Future modules planned for 2015 and early 2016 include: ERD/γ, a radioactive source and true random voltage generator, and ERD/WORM speech synthesizer and vocoder."
"ERD/SIR offers a fully fledged viral computation unit including a central plague unit [CPU] acting as interpreter for selected instruction sets which operate on the interior cells or sound-generating individuals (the simulation of a medieval village within the synth). Instruction sets include masque (of the red death, courtesy of E.A Poe), brainfuck, redcode, plain plague and SIR (susceptible, infected, recovered).
ERD/SIR is a digital/analogue module which can be used as a stochastic, chaotic pattern and waveform generator. The three knob controls and CV can be used to change the speed of simulation and output voltage, the selected plague and instruction set, and to actually input instructions, live coding style, into the simulated plague processors or CPUs."
ERD/LICHT transforms and amplifies the oscillations and perturbations of photons into the massed movements of electrons, thus electricity and perhaps only then into sound waves. There is one amplified output and one gate output (2ms 0-5v), corresponding to the rising edge of a dazzling approach (a disco strobe for example). 
