PreSonus Ampire XT Classics for Studio One

It is a guitar rig simulator that leverages State Space Modeling for uncannily realistic re-creations of classic (expensive and heavy) guitar amplifiers, cabinets, and pedals. State Space Modeling is the surgical measuring and digital re-creation of analog hardware on a per-component level. Each capacitor, every resistor, all the diodes, and every circuitry element of the complete hardware schematics have their behavior measured, modeled, and re-created, including even component-specific non-linearities.