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The Access Virus C (released in 2002 by Access Music) is a classic, DSP-powered virtual analog synthesizer. Housed in a durable chassis with wooden end-cheeks, it became an industry standard for electronic music genres like trance, techno, and industrial due to its thick tone and deep modulation architecture. 

Main Improvements Compared to the Virus B

• Polyphony: Increased from 24 voices on the Virus B to a maximum of 32 voices on the Virus C (depending on patch complexity).
• Modulation Matrix: Expanded to 6 sources and 9 destinations (up from the Virus B's smaller matrix), offering much deeper routing flexibility.
• Filter Options: Added a new Moog-style filter emulation mode (up to 36 dB/octave sloped options) alongside the existing multimode filters.
• Onboard EQ: Introduced a dedicated 3-band parametric EQ per patch.
• Effects Processing: Upgraded to handle up to 98 simultaneous effects (including independent phasers, choruses, distortions, ring modulators, and delays per part).
• Workflow & Interface Tools: Added a handy Undo/Redo function for patch editing, a Random patch generator button, and a dedicated Oscillator 3 On/Off hardware switch.
• Aesthetics: Swapped the dark/red color scheme of the Virus B for a sleek silver/grey look with rubberized/wooden side panels. 

Full Detailed Specifications:

Synthesis Engine & Voice Architecture

• Type: Digital/Virtual Analog (DSP-based)
• Polyphony: Maximum 32 voices (dynamic allocation)
• Multitimbral Parts: 16 parts simultaneously
• Oscillators per Voice: 3 main oscillators + 1 sub-oscillator + Noise generator (Sawtooth, variable pulse, sine, triangle waveforms, plus hypersaw/wavetable-style options)
• FM Synthesis: 5 FM modes for cross-modulation and metallic/bell textures
• Filters: 2 independent multi-mode filters per voice (Low-pass, High-pass, Band-pass, Band-reject, Parallel, Split, and Serial modes with slopes up to 36 dB/octave and saturation/overdrive stages)
• Envelopes: 2 ADSTR envelope generators (Amplifier and Filter/Modulation)
• LFOs: 3 LFOs featuring 64 different waveforms that can sync to MIDI clock 

Modulation & Arpeggiator

• Modulation Matrix: 6 modulation sources and 9 destinations
• Arpeggiator: 16 independent arpeggiators (one per multitimbral part) with 64 preset patterns, modes (Up, Down, Up/Down, As-Played, Random, Chord), and swing controls
• Vocoder: 32-band vocoder that repurposes filter controls for carrier/modulator signals 

Effects

• Simultaneous Effects: Up to 98 effects total across parts 
• Effect Types:
• • 16 Phasers
  • 16 Choruses
  • 16 Distortions
  • 16 Ring Modulators
  • 16 3-Band Parametric EQs
  • Global Delay and Reverb
  • 32-Band Vocoder
  • Surround Sound processing 

Memory & Presets

• Total Storage: 1024 programs
• • 256 User programs (RAM)
  • 768 Factory/ROM programs (Flash-ROM, Banks C-H)
  • 128 Multi-timbral setups

Hardware & Physical Specs

• Interface Controls: 32 physical knobs, 35 buttons, 69 LEDs, and a backlit LCD screen 
• Audio Outputs: 6 analog outputs (arranged as 3 stereo pairs or 6 individual outputs) 
• Audio Inputs: 2 analog inputs (18–24-bit A/D converters) for processing external signals through the filters and effects 
• MIDI: MIDI In, Out, Thru (5-pin DIN)
• 
  Variants:
  
• Virus C (Desktop Module): Compact tabletop metal chassis with wood cheeks.
• Virus KC: 61-key semi-weighted keyboard with velocity and aftertouch.
• Indigo 2: 37-key compact keyboard version with aluminum/blue LED design.
• Virus Rack XL: 1U rackmount version (short-lived production run).