The Access Virus is a German made synthesizer which employs various synthesis techniques (currently VA, Subtractive, PD, FM and Wavetable(Ti) synthesis) which was first produced in 1997 and has since been upgraded frequently, with the company releasing new models about every two years. The latest of these are the Access Virus TI, Polar TI and Snow models. The first two were released in November 2005, while the Snow was released in February 2008.
Currently, there is also a new version called TI2 which came out in March 2009. It features faster DSP, greater polyphony, more effects in the effect section and slightly changed design. The term Access Virus can be used to refer to any one of these synthesizers.
The Virus series also has come out with two software plugin versions: TDM for Pro-Tools and VST for TC Electronic Powercore series. All of the Viruses are DSP-powered, virtual analog synthesizers. They have classic analog-style oscillators which can be tuned continuously from a pure sine wave to a square wave (with variable pulse-width modulation), as well as 63 "spectral" waveforms which are entirely synthetic, non-analog style waves.
Oscillator waveforms may be modulated in a number of ways: Ring Modulation (AM); Phase Distortion (PD) or Frequency Modulation (FM), providing for further sonic manipulation. The Virus has an extensive Matrix Modulation specification. With the TI series new oscillator models (synthesis methods) were added like Hypersaw and Wavetable oscillators.
The Virus comes with many different types of analog and digital style distortion, as well as filter saturation. The filter section is highly customisable, compared to most other synthesizers, with the Viruses having two independent resonant filters that can be combined in various ways. The extensive Matrix Modulation specification allows for creation of complex sounds with some progamming.