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Synthesis Technology E330 Multi-Mode VCO User Manual

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E330 Multi-Mode VCO
www.synthtech.com/eurorack/E330

What is the E330?

The E330 Multi-Mode VCO is a digital audio-rate oscillator with 3 different modes of operation, selected
by a front panel switch. There are 2 parameter controls/CV inputs that vary the behavior of the E330
based on the mode.
The E330 is not designed to be a LFO, the SynthTech E355 Dual Morphing LFO is better suited and
makes a great modulator for driving the E330.

Connecting to the power supply

The E330 uses a standard 16-pin Euro power cable. The -12V is the Red Stripe (Pin 1), and this is
indicated on the pc board. Reverse-supply diodes will prevent the module from damage if the cable is
reversed.

OVERVIEW

The E330 has 2 audio outputs OUT1 and OUT2, which are controlled by MODULATION A and
MODULATION B panel controls, respectively. Depending on the mode selected, these controls will
alter the outputs in different ways.
The 2 CV inputs MOD A and MOD B are summed with the setting of the panel controls, so there is no
attenuation built-in. The input voltage range is -5V to +5V, but in order to use this full-range the
corresponding panel pot must be in the 12:00 (straight up) position, or the CV will be internally limited
to the min or max endpoint(s). It is strongly suggested to use an external attenuator or VCA module to
first attenuate the incoming CVs to get the widest range of possible sounds from the E330.
COARSE and FINE set the output frequency. FM CV input is attenuated by the FM panel control and
summed with the COARSE/FINE settings. 1V/OCT is a tracking 1V/octave CV input (no attenuator).
SYNC input will reset the VCO in all 3 modes, to minimum phase value if the sync signal exceeds 0.45V
(positive-level sensitive).

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Summary of Contents for Synthesis Technology E330 Multi-Mode VCO

  • Page 1 What is the E330? The E330 Multi-Mode VCO is a digital audio-rate oscillator with 3 different modes of operation, selected by a front panel switch. There are 2 parameter controls/CV inputs that vary the behavior of the E330 based on the mode.

  • Page 2: General Info

    2-OP FM Mode 2-OP is an abbreviation for Yamaha’s ‘2-operator’ FM synthesis. The E330 generates 2 sine oscillators and FM modulates one with the other. The modulated result is on OUT 1, while OUT 2 has just the sine VCO which is modulating the carrier (the audio). The 2 parameters you can control are the Depth of Modulation (or the ‘Index’) using MODULATION A/MOD A and the ‘Ratio’, which is the ratio of the frequency of the modulator to the carrier, using MODUALTION B/MOD B.

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