BIAS X is an advanced, AI-powered guitar multi-effects platform that lets you create tones by describing the sound you want.
With tools like Text-to-Tone and Music-to-Tone, you can build or match guitar tones instantly—just by typing a prompt or uploading a recording. Powered by a new AI-driven tone engine, BIAS X delivers unmatched realism, flexibility, and creative control.

BIAS X combines a professional-grade sound engine with Agentic AI, enabling two core workflows:

• Text-to-Tone: Describe the tone you want, and the AI builds it automatically.
• Music-to-Tone: Upload a clip of a guitar tone, and BIAS X recreates it instantly.

You can refine your tone using AI suggestions or full manual control—moving gear anywhere in the signal chain, tweaking amp stages, or customizing effects.

BIAS X is Positive Grid’s next-generation guitar multi-effects software, designed from the ground up to deliver better tone, smarter workflow, and a more modern experience. Compared to BIAS FX 2, it features:

• A completely new tone engine with AI-powered amp and effect modeling
• All-New Cabinet Simulation: Developed by Positive Grid engineers and in partnership with Spectre Digital, featuring high-fidelity IRs of legendary cabs and mics.
• A redesigned immersive UI, optimized for speed and creative flow
• Built-in Agentic AI that helps you build, match, and refine tones in seconds
  
  

BIAS FX 2 was built around traditional tone modeling with static signal chains. BIAS X introduces dynamic AI-powered tone construction, a broader range of gear in one package, and intelligent features that reduce the time between inspiration and output.

BIAS X features an entirely rebuilt sound engine that uses advanced AI-driven modeling to replicate real-world gear behavior with greater realism and depth. It includes:

• AI-powered tube simulation
  Simulates true tube dynamics—sag, response, and harmonic behavior—for more natural feel and responsiveness.
• AI-driven bias-point shifting
  Captures subtle amp behavior changes under different voltages and gain levels, enhancing touch sensitivity.
• Preamp, Power Amp, and Tone Stack AI modeling
  Each section of the amp circuit has been modeled separately and intelligently, resulting in a much more authentic tone stack interaction and nuanced amp behavior.
• All-new cab simulation
  Developed with world-class tone experts, this system uses real-world capture methods to deliver greater realism, clarity, and dimension. This isn’t just another IR loader—it’s a complete rebuild of how cabinet tone is created and rendered.

Agentic AI is your personal tone assistant built directly into BIAS X. It speeds up the workflow for pros and opens creative doors for everyone.

Agentic AI supports two major features:

• Conversational AI
  Describe what you want—“Give me a fuzzed-out surf lead” or “Make this rhythm tone tighter”—and the AI builds or tweaks a preset in real time, selecting gear and adjusting parameters automatically. It can also give you feedback about your tone and tweak it with recommendations. 
• Music-To-Tone
  Drop in a guitar track or full song, and the AI analyzes the tone and reconstructs a matching preset. This is ideal for producers or players wanting to replicate recorded tones fast.

BIAS X includes 33 amp models, 25 cabs, and 63 effects. The gear spans classic, boutique, and modern sounds across multiple genres, giving users a versatile all-in-one solution.

Yes. BIAS X supports dual-amp configurations, stereo rigs, and parallel processing chains—perfect for custom and complex tone builds.

Yes. You can load your own impulse responses to further shape your cabinet sound.

Yes. MIDI support was introduced in BIAS X starting with version 1.2. This allows you to assign knobs, switches, and other parameters to external MIDI controllers or footswitches. If you’re using an earlier version, you’ll need to update to access this feature. Logic Pro and GarageBand users should review our update guidance before installing to ensure a smooth transition from previous sessions.

ToneCloud is not part of BIAS X. 

Presets from BIAS FX 2 are not directly transferable into BIAS X due to the new engine architecture and feature set. 

However, you can still use both side by side. If you have a preset in BIAS FX 2 you love, export a short audio clip of it and upload it to Audio to Preset in BIAS X—letting the AI rebuild that tone instantly using the new engine. This approach offers higher fidelity than preset import and better utilizes the new AI engine.

Currently, BIAS X does not support expansion packs from BIAS FX 2, including the Hendrix pack. BIAS X introduces a redesigned sound engine and gear ecosystem, which may not be compatible with legacy content from FX2. Please stay tuned for future updates regarding compatibility.

• macOS: Audio Units (AU), VST3, AAX
• Windows: VST3, AAX
• Note: BIAS X does not support VST2.

 Yes. BIAS X runs natively on Apple Silicon (M1, M2).

See COMPATIBLE DAWs in the Spec section.

Yes, you can run BIAS X without a DAW—perfect for practice, live use, or building tones quickly.

BIAS X is designed exclusively for desktop use and is compatible with macOS and Windows operating systems. It runs as a 64-bit VST3, AU, or AAX plugin, or as a standalone application. Mobile devices such as iPhones, iPads, and Android phones or tablets are not supported.

Yes. BIAS X is optimized for electric guitar but works well with bass and acoustic instruments too, thanks to its flexible gear and tone shaping options.

No—but if you do, you’ll love what’s under the hood. BIAS X is built for flexibility at every level: you can get great tones fast using AI tools, or take full manual control to fine-tune every detail. Move gear freely anywhere in the signal chain, shape amp behavior stage-by-stage, and design complex dual-amp or stereo setups. Whether you’re moving fast or going deep, BIAS X supports your workflow.

• Modern, clean design with top/side/bottom bars for faster navigation
• More screen space for tone editing and signal flow clarity
• New Gear Menu for quick drag-and-drop tone building
• Revamped Preset Manager with smart foldering and easy file control

Yes. BIAS X is a perpetual license. No subscription required.

You can activate BIAS X on five devices simultaneously. Deactivation is possible if you upgrade or replace your computer.

Yes—for first-time activation and to use AI features like Text-to-Tone and Music-to-Tone. Once activated, BIAS X can run offline for regular use.

If you already own a BIAS product (BIAS, BIAS FX 2, BIAS Amp), you may be eligible for a special upgrade price on BIAS X depending on your current license. Follow this link to see if you qualify.

If you already own a Spark series guitar amp, you may be eligible for a special upgrade price on BIAS X. Follow this link to see if you qualify.

macOS

• macOS 11.7 or newer
• Intel Core i5 (8th gen) or Apple Silicon (M1/M2…etc)
• 8GB RAM minimum
• 1GB storage
• Dedicated GPU recommended
  
  

Windows

• Windows 10 (22H2) or newer
• Intel Core i5 or better
• 8GB RAM
• 2GB storage
• Dedicated GPU recommended