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Rossum Electro-Music Assimilator

Rossum Electro-Music Assimilator
Rossum Electro-Music Assimilator
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Ex Tax: 940.34€
  • Designed to provide a powerful, flexible sampling engine for modular synthesis, the ASSIMIL8OR Multi-Timbral Phase Modulation Sampler module is the latest incarnation of Dave Rossum’s decades-long pioneering of affordable professional sampling technology.

    ASSIMIL8OR provides eight independent channels of sampling with sound quality that can range from extremely hi-fi to low fi, all with extensive real-time CV control.

    Key ASSIMIL8OR features will include:

    •  Eight-channel multi-timbral operation. Each channel will be available from its own independent output as well as appearing in the stereo mix output.
    • Superb 24-bit A/D and D/A conversion.
    • Mono or stereo sampling. Channels can be configured as eight mono voices, four stereo voices, or any combination. (Well, any combination that adds up to eight).
    • The ability to assign up to 8 samples to each channel and select between them in real time via CV.
    • DC coupling through the signal path for sampling of control voltages.
    • Unique timbral capabilities with the ability to phase modulate samples by external analog signals or by other samples (a first, we believe).
    • Variable sample fidelity with independently selectable sample rate and bit depth.
    • Real-time CV control of bit depth.
    • Real-time CV control of aliasing (from virtually none to lots).
    • Extensive sample manipulation and looping capabilities.
    • Sample scrubbing under CV control.
    • One-shot or gated sample playback with variable attack and release times.
    • Gate/trigger inputs and CV inputs for each sample that can be assigned independently for each channel to virtually any sample parameter. Examples include:Pitch
      Bit Depth
      Phase Modulation
      Sample Start
      Sample Length
      Loop Start
      Loop Length
      Release Time
    • A front panel accessible SD card for sample and preset storage.
    • And a lot more…
    • Assimil8or Specifications


      2,300 seconds at 48kHz mono, freely allocatable between the 8 channels


      48kHZ, 96kHZ, 192kHZ

      A/D & D/A

      24 Bits


      32 Bits


      100 microseconds at the Mix Outputs

      180 microseconds at the Individual Outputs


      Sample L/R

      2x 3.5mm mono socket

      100kΩ Input Impedance

      Gate/Trigger 1-8 

      8x 3.5mm mono socket

      100kΩ Input Impedance

      1.6V threshold

      Control Voltage A 1-8

      8x 3.5mm mono socket

      100kΩ Input Impedance

      96 kHz sample rate

      Anti-alias filtered to 20kHz bandwidth

      Control Voltage B&C 1-8

      16x 3.5mm mono socket

      100kΩ Input Impedance

      48 kHz sample rate

      No anti-alias filtering


      Mix Outputs L/R

      2x 3.5mm mono socket

      1kΩ Impedance

      Individual Outputs

      8x 3.5mm mono socket

      1kΩ Impedance


      +/-12V via 16-pin, Doepfer-style connector


      220mA +12V, 30mA -12V


      28HP (W); Panel to power connector (with connector plugged in) 25mm (D)


      1x Micro SD card
      1x 16-pin, Doepfer-style cable
      4x M3 screws
      4x M2.5 screws
      4x Nylon washers
      1x Quickstart Guide

      Dave’s Introduction to Phase Modulation

      Phase modulation is a new kind of audio cross-modulation for sampled sounds.  It can produce rich and varied timbres and textures, as well as wild distortions and grating noises.

      The word “new” is probably not accurate.  Modular synthesizers have used frequency modulation (FM) since their inception.  Low frequency FM produces nice vibrato effects, and audio rate FM creates interesting timbres.  But exponential FM alters the perceived fundamental frequency of an oscillator; linear FM is required to alter the timbre while staying on pitch.

      When we use FM, we call the source of the modulation the modulator, and the oscillator being modulated is called the carrier.

      In the early 1970’s, John Chowning discovered using digital oscillators that linear FM through the zero point (so the carrier actually reversed its oscillation) produced very diverse and pleasing timbres.  Yamaha further developed this technology, but while Yamaha continued to call their implementation “FM”, they actually were using Phase Modulation.  Also worthy of note, Don Buchla heard Chowning say that you couldn’t do “through zero” FM with an analog circuit, so Don did just that with his Music Easel’s Complex Oscillator.

      Let’s look at some oscilloscope photos to understand the difference.  If I frequency modulate a sine wave with another sine wave, the ‘scope shows us the effect on the waveform.  (The modulator is on the bottom in blue, the carrier in yellow on the top):

      Now let’s use a pulse waveform to modulate a sawtooth wave carrier:

      Here you can see that when the pulse is high, the sawtooth gets steep, when it’s low, the sawtooth slope is slight.

      Now let’s use “through zero” modulation and turn up the gain of the modulator to show how the sawtooth slope now goes downward (backward) when the FM goes negative:

Please Note
We ship globally with the fastest possible way. For cities of Europe is usually 24 hours dleivery if you order till 15:00 Athens Time. For customers that are out form the city we ship with Greek post registered 4-5 days for delivery. For Rest of the World we ship with Fedex 10-12 days . If you have any issues we are happy to assist you. Synthesizer GR Team