The Blackstar IDX:Floor Three is a flagship multi-effects floorboard and amp modeler that utilizes advanced component-level DSP to recreate the response and feel of classic valve amplifiers. It features 12 electric guitar amp models, including Blackstar’s modern voicings and Ampton recreations of historic circuits, alongside dedicated modes for bass and acoustic instruments. The unit incorporates "In The Room" technology and a patented ISF (Infinite Shape Feature) to provide a more natural, immersive playing experience compared to traditional direct-signal modelers. A physical Response control allows players to select between different power valve emulations, such as EL84, EL34, and 6L6. It includes an integrated expression pedal, a full effects loop, and extensive MIDI connectivity, making it a comprehensive solution for both stage and studio.