E-RM Launched Polygogo Stereo Eurorack Oscillator Based On Polygonal Synthesis

E-RM Polygogo is an innovative stereo oscillator for Erorack format based on polygonal synthesis invented by E-RM & DSP specialist Christoph Hohnerlein.

Eurorack oscillators are many available on the market, especially classic analog (3340 wave is fully active). Digital, on the other hand, are often the most exciting for me. The developers of ER-M from Berlin now show that it is possible to be innovative in the Eurorack oscillators. Polygogo is a truely innovative graphical stereo oscillator that is based on the newly developed polygonal synthesis by the founder of ER-M Maximilian Rest and DSP specialist Christoph Hohnerlein. The main core is based on two-dimensional complex amplitude shaping of sine waves.

One of the highlights is also the lovely single knob single function interface created in collaboration with the best-known instrument designer Tatsuya Takahashi (Ex-KORG). The module has no unnecessary menus and is, therefore, perfectly suitable for live performances. Visual artists will also enjoy the Polygogo oscillator because it has laser system support via the X and Y outputs.

E-RM Polygogo

The sounds that you could hear so far are very impressive and range from lush drones, massive basses, fierce leads, glitch madness and even sounds reminiscent of acoustic instruments. For me personally, it’s not just one of the best sounding oscillator but also one of the best-looking modules.

Polygonal Synthesis

Polygonal Synthesis is heavily centered around the interaction between user and polygonal object behind the OLED screen. Based on the number of vertices (order) and their displacement (teeth), the fundamental tone and the harmonic ratio are created. Rotational modulation (roll) pans the sound in the stereo field or acts as a vibrato. The internal linear FM operator (OP ratio / OP amt) can modulate the fundamental frequency and its high spectral content. An analog overflow stage at the output (fold) is able to act as a wave crusher – thus, it gives sounds the finishing touch right in front of the output (X/Y)

All main parameters are accessible via sliders. For fine-tuning and to give sounds some additional tweaks, potentiometers were added. Control voltages can be used to modulate each and every parameter. With a cable plugged into one of the CV inputs, the corresponding potentiometer turns into an attenuator respectively attenuverter. Push buttons allow you to choose between three modes of operation. In detail, there are “Infinite Cycling”, “quantized Order” and “stepped OP ratio”. Last but not least, a hard sync input is available.

E-RM Polygogo Features

  • E-RM Polygonal Synthesis technique
  • 384 kHz internal sample rate
  • 24 bit / 96 kHz stereo output
  • High contrast OLED interface
  • Six performance sliders for all main parameters
  • Eight fine-tune potentiometers/precision attenuators respectively attenuverters
  • Three push buttons with LED feedback for selecting a mode of operation
  • High-speed V/oct and exponential FM inputs (24 bit / 96 kHz)
  • Six actively filtered CV inputs (16 bit / 6 kHz)
  • One trigger input for hard sync

Features

  • E-RM Polygonal Synthesis technique
  • 384 kHz internal sample rate
  • 24 bit / 96 kHz stereo output
  • High contrast OLED interface
  • Six performance sliders for all main parameters
  • Eight fine-tune potentiometers/precision attenuators respectively attenuverters
  • Three push buttons with LED feedback for selecting a mode of operation
  • High speed V/oct and exponential FM inputs (24 bit / 96 kHz)
  • Six actively filtered CV inputs (16 bit / 6 kHz)
  • One trigger input for hard sync

E-RM Polygogo Eurorack module will be available in Winter 2019 for a price of 539€ (MSRP) incl. VAT.

More information here: E-RM

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