Synthesis Technology E300 Ultra VCO, New Super Precise Oscillator For Eurorack

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Synthesis Technology E300 Ultra VCO is a new Eurorack VCO which is based on the MOTM-300 5U oscillator (Dave Rossum design) with new features & improvements

Paul Schreiber of Synthesis Technology will announce two modules at this year’s Knobcon. The first module is the E300 Ultra VCO which is based on the 5U MOTM-300 VCO with new features and modern improvements. The MOTM-300 (introduced in 2000) was based on a sawtooth core design by synth guru Dave Rossum and used in the unique EMU Modular.

The MOTM-300 featured better performances by using new better resistors, newer op-amps with low-temperature drift and more. The re-issues in Eurorack format features a re-design of the sawtooth core to take advantage of today’s improved silicon and passive components.

Synthesis Technology E300 Ultra VCO

The E300 still uses precision, low drift resistors, adding improved C0G ceramic timing caps, the latest in low drift and low THD OPA op amps, and a new, unique triangle waveshaper that generates ‘glitchless’ triangles and sine waves. The MOTM-300 was very sensitive to the rise time of external VCOs used to sync, and the E300 uses a much-improved sync/triggering scheme to allow any signal, with fast or slow edges, to reliably force sync.

They decided that a more useful feature not in the MOTM-300 was a switchable -1/-2 suboctave (square wave) on a dedicated output jack.

Please see the Specification link for a detailed description. In October, we will have audio and video demos. And the User Manual.

Synthesis Technology E300 Ultra VCO

The interface features the following controls: coarse, fine-tune, pulse width, PWM CV, FM1, FM2, FW1 switch (selects exponential or linear frequency modulation via FM1 input (can be audio rates) and SUB (select 1 or 2 octaves below). The following inputs/outputs are available:

  • Inputs: 1V/Oct, FM1, FM2, Sync, PWM
  • Outputs: sine, triangle, sawtooth, pulse and sub.

Synthesis Technology E300 Ultra VCO will be available in November (15th) worldwide for an MSRP of $299 USD in the USA. The module will also be available in black at no additional charge.

More information here: Synthesis Technology 

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