Coming soon

BIAS Desktop

BIAS Desktop is a plug-in for Mac OS X and Windows with which you can create amp models in a new way never before thought possible.

The BIAS Explorer Program is designed for people who want to get involved early to shape the future of BIAS. If you’re interested, please sign up here and we’ll let you know if a spot opens up.

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Insanely Great Tone

Create totally new sounds by designing your custom dream amp. BIAS is now available for Mac OS X and Windows.

Using Bias’ highly intuitive and lightning-fast interface, it’s child’s play to instantly swap out colorful tube preamps, lush distortion circuits, classic tone stacks, boutique power stages, custom-built transformers and cabs loaded with specially matched speakers.

The result is a dynamic depth and range of tones not possible using traditional guitar amps or other static modelers.

Amp Matching

Modify your BIAS amp model to match any real-world, miked guitar amplifier or recorded track.

Amp Matching utilizes a collection of underlying technologies to analyze and compare your currently selected BIAS amp model and the target amplifier (or recorded track). It then executes the tonal compensation and enhancement needed to make your amp model sonically match the target amplifier.


Share and download artist- and user-designed and matched amps right inside Positive Grid’s ToneCloud®.

The tone-creation possibilities are now virtually infinite with BIAS. Download artists’ signature amps, or try out the latest and popular user-created tones. Search for that special tone you’ve always wanted.

BIAS Expansion

In addition to the industry-acclaimed BIAS Standard preamp and power amp modules, BIAS Desktop offers three new preamp and power amp modules optimized for specific tone styles: Glassy, Crunch, and Insane.

While BIAS Standard modules offer the maximum flexibility to customize the most sought-after amp models, the Expansion Packs’ preamp and power amps are designed for specific tone styles. Using an optimized internal sound engine and providing more intuitive controls, they push the sound quality to achieve extreme authenticity and richness in dynamic response.

Amp Matching

Fluff shows how to use BIAS to match his Randall Thrasher high gain channel.



  • The most complete, accurate, and versatile amp modeling software available in the world
  • 36 HD amp models included with the introductory release
  • Amp Matching captures any miked amp or recorded track and creates a matched model
  • Share and download thousands of artist- and user-created and matched amp models on ToneCloud
  • Fully customizable preamps, tone stacks, power amps, transformers, cabinets and mic selection and placement—mix and match!
  • Customize the look and feel of your own amp panel; change the name, tolex, panel and knobs.
  • Works the way guitarists think: tweak gain and overdrive, swap out tubes and transformers, change the cabinet and mic position, and shape the tone with different tone stacks and two 8-band equalizers
  • Included noise gate and room simulator
  • Create a virtually unlimited number of custom amps
  • Quick preset facility recalls each of your 8 favorite settings in turn with just one tap

Mac® (64 bit CPU, 32- or 64-bit Mac OS X)

  • Minimal: 1.5 GHz Intel processor, 1 GB of RAM, Mac OS X 10.6 or later.
  • Supported Plug-in formats: Audio Units, VST, RTAS, AAX (32 and 64-bit).

Windows® (32 and 64 bit)

  • Minimal: Intel® Pentium 4® 2.4 GHz or Intel® Core™ Duo or AMD Athlon™ 64, 1 GB of RAM, Windows® XP, Windows® Vista, Windows® 7, or Windows® 8.
  • Supported Plug-in formats: VST, RTAS, AAX (32 and 64-bit).