With over 500,000 lines of new code and 2 years development.

BIAS Desktop is the world’s most accurate, thorough and versatile guitar-amp modeler and designer. Its advanced amp-modeling engine captures the warmth and feel of real tube amps in every aspect, component by component. To start, the plug-in includes 36 authentic models of the most sought-after vintage and modern amps in rock ‘n’ roll history.

Easily modify amp models by swapping out the tubes, preamp, transformer, tone stacks, cab and mic with simple mouse clicks to create their own custom amps and unique signature sound.

BIAS Desktop Features Overview

See what Ola Englund has to say about BIAS Desktop and his custom matched tone.

Accurately capture the sound of all your favourite tube amps.

Amp Matching utilizes a collection of underlying technologies to analyze and compare your currently selected BIAS amp model and the sound of a target tube amplifier, the corresponding cabinet and the microphone in front of it. It then executes the tonal compensation and enhancement needed to make your amp model accurately match the target tube amplifier.

Sampling the world of tube amps.

Fluff shows how he uses Amp Matching to capture his favourite tube amps.

For the first time in history, guitar players are free to design, modify and capture the most unique and individual soul of tone, into the digital domain and keep it ready for any recording application.

Download amp models from the cloud.

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-matched amp models.

Positive Grid is currently working with world wide session artists and engineers to create professional custom amp models and studio amp matched models, stay tuned with us as more is coming.

“BIAS Desktop represents an entire new concept on guitar sound. It has the most authentic tube sound engine, and the stunning interface makes it possible for users to go deeper to pursue the tones they have envisioned, and Amp Matching Technology allows users to capture their golden tube amplifier, and finally users can share and download amp models from ToneCloud, just like Spotify for amps.”

the Positive Grid team



  • 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


  • OS X 10.7 or later
  • Audio Units, VST, AAX (32 and 64-bit)


  • Windows 7 (SP1) or Windows 8
  • VST, AAX (32 and 64-bit)