Audiffex is a Czech audio software brand founded in 1998 in Brno, Czech Republic by engineer Petr Krkavec and a group of students from Brno University of Technology. Originally operating under the name DSound, the company rebranded to Audiffex in 2005 to avoid web-search conflicts with unrelated entities sharing the DSound name. From 2015, Audiffex became a product line within the broader Audified brand, which now serves as the parent company.

Audiffex products focus on guitar and bass amplifier simulation, effects modeling, and live performance tools. Their flagship guitar plugin, ampLion Pro, provides detailed emulations of guitar preamps, power amps, speakers, microphones, and effects in both standalone and DAW plugin formats (VST, AU, AAX). For bass players, the GK Amplification series models Gallien-Krueger bass amplifiers, including the 800RB, 2001RB, and MB150 heads. The Audiffex Pedals collection offers 36 stompbox-style software effects covering dynamics, EQ, filtering, and amp simulation. Their inTone 2 application serves as a real-time performance environment combining a multichannel effects processor, software mixing console, virtual instrument host, and multitrack player — designed for musicians performing live on stage.

Audiffex has 7 products cataloged on Equipboard, including Amp Simulator Plugins, Distortion Plugins, and Multi-Effect Plugins.