MATRIXSYNTH: The ASV - Complete Synthesiser Voice by Oakley


Tuesday, November 20, 2018

The ASV - Complete Synthesiser Voice by Oakley


via Oakley Sound Systems

"The Oakley Analogue Synthesiser Voice, or ASV, is a complete analogue synthesiser in a 5U wide, or four MU width, module for the MOTM and MU formats. It consists of the traditional synthesiser architecture of two oscillators feeding a single filter, via a mixer, and then to an amplifier. Two identical four stage envelope generators (ENV1 & ENV2), and one sine wave low frequency oscillator (LFO) act as modulation sources to control the sound in a dynamically interesting way.

Each voltage controlled oscillator (VCO) is based around a classic sounding sawtooth core. VCO2's frequency can be hard synchronised to VCO1 by a front panel switch. Both sawtooth and variable width pulse waves are generated. These are both available from the socket field but only one from each VCO may be selected in the audio mixer that feeds the filter. An additional triangle wave from VCO1 can mixed with the audio signal from the filter prior to the final amplifier.

The AVS also has a sub-oscillator. This produces a triangle wave output that is half the frequency of VCO 1, that is, one octave below the pitch of VCO1. By default this is sent to the third level control on the mixer although this can be overridden by inserting a jack plug into the 'mixer in' socket. The sub-oscillator's output is also available on the socket field.

The pitch of both VCOs may be controlled by a master tune control on the front panel. Two octave switches independently control the base pitch of each of the VCOs. Each switch covers a range of three octaves. The pitch of VCO2 may also be offset from VCO 1 by the VCO 2 Tune control. The range of this control covers just over one octave from unison at the 9 o'clock position to an octave above at around 3 o'clock.
Pitch may also controlled by external control voltages (CVs) and internal sources such as the LFO and ENV1. Front panel pots control the depth of this modulation.

The pulse wave output from each VCO can be manually controlled by the pulse width controls. At their middle settings both pots will produce a 50% pulse wave, ie. a square wave. The pulse width of both VCOs can be dynamically altered with external CVs, or internal sources. Both VCOs use special circuitry to make the their average voltage output equal to zero. This reduces audible thumping when the pulse width is modulated quickly."

Additional info at Oakley Sound Systems.

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