ADDAC Intros ADDA701 Voltage Controlled Oscillator

ADDAC Systems has introduced the ADDA701 Voltage Controlled Oscillator for Eurorack modular synthesizers.

The ADDAC701 is a fully analog Voltage Controlled Oscillator. It works at both the audio and sub-audio ranges (0.01 to 40.000 Hz), with four simultaneous waveform outputs (rectangular, sawtooth, triangle and sine).


  • Four simultaneous outputs of Rectangular, Sawtooth, Triangular and Sine waves.
  • Audio frequency range: 1 – 40.000 Hz.
  • Low Frequency range: 0.01 – 400 Hz.
  • Pulse width control for rectangular wave with two mixable inputs.
  • Microtuning with dedicated CV input.
  • Linear Frequency control input.
  • Week and Strong Sync trigger.
  • Auxiliary Out with normal and inverted outputs, with choice of waveform and output level.

The ADDAC701 VCO is priced at 400 Euros.

In the video, above, you can see 3 ADDAC701 VCO’s in action.

  • It starts with all three in rectangular waveforms with fast pwm modulation through the ADDAC502 Lissajous Curves.¬†ADDAC501 Complex Random in Quantized mode is used to generate the notes heard at a fixed speed.
  • The video goes through with all 3 VCO’s in Saw waveform, then in Triangle and last with Sine Waveform.

A detailed description of the patch:

Audio Path:

  • All three ADDAC701 VCO’s are connected to ADDAC801 Simple Mixer from their AUX OUT+
  • Second and third VCO’s are also connected to the bottom oscilloscope of ADDAC205 Dual Oscilloscope from their AUX OUT- output.
  • The ADDAC801 Output is both connected to the sound system and to the top oscilloscope of ADDAC205 Dual Oscilloscope

Control Path:

  • Each of the 3 ADDAC501 Complex Random outputs is conneced to each VCO, controlling their frequency, ADDAC501 is in Quantized Mode.
  • 3 outputs of the ADDAC502 Lissajous Curves are connected to the PWM of each VCO.

2 thoughts on “ADDAC Intros ADDA701 Voltage Controlled Oscillator

  1. This track is eff’ing beautiful. I’ve replayed the audio starting at the ’45 sec to the very end over and over like ten times already.

    I like how it’s exlusively left ch. until the end where it fades to noise as it also fades into stereo.

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