Access Virus B

Access Virus B Image

Following up on the success of the popular Virus, Access unleashed an upgraded model in 1999, the Virus B. The original Virus A had 12-voice polyphony, but the new OS in the Virus B doubles the polyphony from 12- to 24-voices and the oscillators, from 2 to 3 per voice. The new OS also added an enhanced programmable 32-band vocoder. There are now up to 82 simultaneous effects, a retro-phaser (6-stage stereo phaser with 24 filter-poles), chorus/flanger, ring modulator, multiple forms of distortion, an analog boost algorithm, and an envelope follower. Up to five FM (Frequency Modulation) modes are also on-board now and many new sounds have been created for this bigger and better version of the Virus.

OS 4.0 was released in late 2000 with even more amazing features! The update is downloadable from Access (free of charge!) and comes installed in all new Virus synths to ship after its release. OS 4.0 adds a reverb with advanced features such as pre-delay sync-able to Midi clock. There's also a groove delay, surround sound capability, external effect sends using the individual outputs, an Intelligent Random Patch Generator, sound categories to sort all your patches in a logical order, Direct FX to use your Virus as an effects-processor while maintaining full polyphony, 16 independent arpeggiators with numerous patterns and realtime parameter access, and an advanced distortion module with lo-fi and filter dsp-effects. OS 4.0 makes the Virus one of the best analog modeling synthesizers to date! Complete control of parameters is available via MIDI. "Adaptive Control Smoothing" ensures ultra smooth parameter changes. There's also a free Emagic sound-driver based Editor/Librarian for Windows and MacOS.

Access VirusKB Image

Virus KB

Pictured above is the Virus KB. It packs all the guts of the Virus B into a full sized keyboard with 61 velocity and aftertouch sensitive keys. There are also individual and assignable Pitch and Mod wheels. Nice emulated wood panels and a layout that remains faithful to the module's intuitive design make the Virus KB model an excellent dance and electronic music synthesizer for professional quality music and groovy results.

Access Virus Rack Image

Virus Rack

In 2001, the Virus Rack (pictured above) was released. This module retains most of the features through version 4.0 but sacrifices polyphony and an oscillator. This was to make the Virus significantly more affordable. Polyphony has been reduced to 16-voices but multitimbrality is still 16-parts. Instead of four, there are three oscillators per voice (two main oscillators plus one sub oscillator). Otherwise it has all the same great features as the Virus B! In 2002 the entire B series line of Virus synths were replaced by all new versions: the Virus C, Virus KC and Virus Rack XL.

Access Virus Indigo Image

Virus Indigo

Late 2000 also saw the release of a sleek, newly styled Virus called the Indigo (pictured above). Dubbed the 'Virtual Analog Roadster', the Indigo is a retro-styled twist on the amazing Virus synthesizer. It blends classic Roland, Moog and ARP style with the great features and sounds of the Virus B (OS 4.0). It adds a stout 37-note keyboard and a cool new grey/blue look. It's compact, easy to play, fun to tweak, and is a powerful synth! In 2002 it was replaced by the Indigo 2.

Viruses have been used by Astral Projection, BT, Überzone, The Crystal Method, KMFDM, Cosmosis, and Nine Inch Nails.

Click here for a PDF comparison chart between all Virus products from 1997 through 2002.

Lookup Access Virus B Prices

The link above will take you to an eBay search for this synth to see active listings with more images, specs and information. If you don't find it there, try looking in our forum marketplace. Our marketplace gets thousands of visits every week so make sure to check back often if you want to buy or sell a synth.

Related forum topics


Are you looking to buy or sell a Access Virus B? Post an ad in Gear For Sale or a request in Gear Wanted. For spare parts and repair services check out Gear Services & Other Goods. Our forums also has a Buyer’s Guide section where you can ask for advice on buying synthesizers.

43 Visitor comments
May 1, 2013 @ 7:56 am
So I read a few places that the B sounds the best out of A and C Virus. Some even said better then TI. Your thoughts? They say it's more warm and full then the rest. Thanks for any info.
Pulse Emitter
April 17, 2013 @ 12:15 am
i originally thought this sounded huge in the store but quickly became tired of it, remove all effects and open the filter and listen to the oscillator naked, not a pleasant sound. sold it while i could get something for it (paid like $1,200 for it new!). last virtual analog i ever bought. nothing like the real thing!
February 19, 2013 @ 9:56 am
The Virus B is still a current instrument. Sound Quality is already 16Bit (internal generation) which is more than sufficiant for this kind of music. The ADCs internally run with 24Bit summarized/downmixed voices) which totally fills the given dynamic range of generated audio. Current system do not have more! Furthermore, several people changed their analog outputs to digital S/PDIF making it even more compatible to nowadays hardware. In Comparison to modern Synths, the Virus is only limited in the number of voices, due to the retricted 56303 prozessor used - the quality of the voices is 100%
November 2, 2012 @ 11:02 pm

Nice to see someone else realizes how this synth is VERY gr8 for ambient, drones, and would think musicians, as most cultural creatives, would be more open-minded and not stereotype an instrument for genre of trance. A hammer can be used for many more things than pounding nails, for example! I have a rather diverse arsenal in home studio from various manufacturers and the virus KB is versatile. I recently added virus KC as there's enough differences and enhancements IMO to justify it rather than buying Waldorf Q, since have MicroQ Omega 75 voice. The Ti don't interest me tho.
October 21, 2012 @ 10:06 pm
At first I was overwhelmed by the interface/menu diving required to program sounds, but with practice got hang of it.

Most people associate Virus B with trance/techno etc... but I find it is great for ambient/drones, especially with long amp attack/sustains and filter saturation curves set to medium or high. The filter is very resonant and the reverb quality is fantastic.

The Virus B is a very warm sounding VA synth and the build quality is excellent. Highly recommended. Here's some demos I made: bgyUz1mcM
VSE Rating


User Rating

Rated 4.01 (911 Votes)

  • Check Price
  • The link above will take you to an eBay search for this synth to see active listings. If you don't find it there, try looking in our forum marketplace or post a wanted classified.
  • Specifications
  • Polyphony - 24 voices (Rack model has 16 voices)
  • Oscillators - 3 Osc per voice plus 1 Sub-Osc: Sawtooth, variable pulse, sine, triangle, oscillator sync. 5 FM Modes: 64 digital FM spectral waveforms. (Rack version has just 2 Osc. plus 1 Sub-Osc.)
  • LFO - 3 LFOs with 68 waveforms
  • Filter - 2 independent resonant filters; lowpass, hipass, bandpass, band reject, parallel, split & 2 serial modes with up to 36dB/voice (6-poles), overdrive/saturation.
  • VCA - 2 ADSTR envelopes
  • ModMatrix - 3 Sources, 6 Destinations
  • Effects - 82 simultaneous effects (34 to 66 in Rack version): 16 Phasers, 16 Choruses, 16 Distortions, 16 Ring Modulators, Delay, 32-Band Vocoder, Surround Sound (not available in Rack version).
  • Keyboard - Virus KB: 61 Keys with note-on/off velocity, pitch bend, modwheel and two switches/control pedals and aftertouch.
    Indigo: 37 keys
  • Memory - 1024 programs (256 User / 768 ROM / 128 Multi)
  • Control - MIDI (16 multitimbral parts)
  • Date Produced - 1999 - 2002

Errors or Corrections? Send them here.