The Access Virus Rack is an Analog Modeling synthesizer with 2 oscillators and one sub-oscillator. This unit has 16 voices that are dynamically allocated to the 16 multi-timbral parts. The Virus Rack has 512 presets divided into 4 banks: A & B (User Editable) and C & D (these reside in the Flash-Ram). Software version 2.2 adds an additional 512 presets by replacing the demo song included in the original software version. There is also a noise generator, ring modulator, two multi-mode filters, two envelopes, a stereo VCA, and a saturation stage for cascade filtering, tube, and distortion effects. Other effects include chorus, flange, analog bass boost, reverb, and midi-synced digital delay. The Virus Rack also includes a 32 band vocoder. Two external inputs allow processing of external devices through the filters, gates and lo-fi effects. External audio sources can also be used to modulate frequency and ring modulation. This unit was first released in 2001, two years after the release of the Virus B, by Access Music of Germany.