Positive Grid Bias FX Desktop is a software-based guitar effects processor that allows users to create and customize their own guitar tones using a wide range of effects and amplifiers. The software is available in VST and AAX formats, making it compatible with most digital audio workstations (DAWs). With its user-friendly interface and vast library of effects and amplifiers, Bias FX Desktop has become a go-to tool for many guitarists and producers.