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Key Features
Product Ref: 288298
Quadrature means that the module produces two trapezoid waves (TRASIN and TRACOS) with a 90 degree phase shift between them. This is like a standard quadrature oscillator like the A-110-4 which produces sine and cosine waves.
The term "Thru Zero" is referring to the use of "negative" frequencies when using the linear FM section on this module. This means that when you are modulating the VCO through the linear section then the pitch will remain constant when the linear control voltage crosses 0v as with standard linear FM this will cause issues with pitch.
All other waveforms like triangle, sawtooth, rectangle and sine are obtained from the TRASIN/TRACOS signals. They are also all available in quadrature pairs.
There are two control sections. The exponential and the thru zero linear section. The exponential section has an XTune control knob, a 1V/Oct input and a XFM input with a corresponding attenuator. The exponential control voltage is the sum of these three voltages. The linear section has a LFrq control and a LFM input with attenuator. The linear control voltage is the sum of these two voltages.
When the LFrq control is fully clockwise the module will act as a standard VCO and you would be able to plug a 1V/Oct signal (such as from a sequencer) into the 1V/Oct input in the exponential section. The LED will turn red to indicate this. The frequency can also still be modulated with the XFM input. When the LFrq is turned counterclockwise the pitch will lower in a linear fashion until the knob reaches the middle. Here the TRASIN/TRACOS (trapezoid) signals will nearly stop. As the knob is moved further in a counterclockwise direction the waves will start again but in a reverse direction. The LED will turn yellow to indicate this. When fully counterclockwise the module will function as a normal VCO again.
This module really becomes exciting when the LFM input is used with an external control voltage. The thru zero VCO means that exciting sounds and timbres not possible on other VCOs are possible with this module.
This module also can run as an LFO. There is a switch on the front of the module and this runs at about 1/100 the frequency of the standard VCO mode