User`s manual

ARTURIA – Analog Lab – USER’S MANUAL 9
Temporal representation of a “sawtooth” waveform reproduced by TAE
®
What’s more, the hardware analog oscillators were unstable. In fact, their waveform
varies slightly from one period to another. If we add to this the fact that the starting
point for each period (in Trigger mode) can vary with the temperature and other
environmental conditions, we see why vintage synthesizers have such a typical sound.
TAE
®
reproduces the instability of oscillators, resulting in a fatter and “bigger” sound.
1.3.3 Direct Filter Circuit Modeling
Due to advances in computer processing power, Analog Lab can now employ direct filter
modeling techniques to achieve unprecedented accuracy in the emulation of a hardware
synthesizer’s filter. By modeling the operation of the individual hardware components of
the filter circuit, the warm nuances synonymous with analog sounds are recreated.
The following graph shows a single example of direct circuit modeling in action. The
peaks represent the generation of harmonics at multiples of the resonant frequency
when a particular filter is in self oscillation mode. These harmonics are characteristic of
hardware synthesizer filters and are due to the non-linear behavior inherent to their
analog circuitry. Anomalies such as these add to the richness and warmth of the sound
produced by the filter.
But you’ll notice there are two lines on the graph: Those are the superimposed frequency
domain plots for both one of Arturia's virtual instruments and the hardware filter being
emulated. They are practically indistinguishable, both on the graph and to the human
ear. The direct recreation of this analog circuitry causes the same characteristics of the
sound to be present, thus giving the user a truly analog sound.