Changes

''Impulse responses'' or ''IR'''s are sound files that represent a transformation of sound caused by some system. They can be used to provide simulations of the reverb of a room, for instance. In the guitar community, they are popular for cab/mic simulation, capturing not only frequency response but phase and resonance information. In a DAW, a convultion reverb plugin is necessary to apply the IR transformation to an input signal. Most modelers provide their own cab/mic block or make it part of the amp block. These typically use IR's, although only a small number allow you to actually import or export the IR's in and out of the modeler.