A powerful sound-design tool—now on your pedalboard!

If you’ve used software or hardware amp modelers, chances are you’ve used impulse responses. The technology, developed by Sony at the end of the last century, is one way that modelers mimic various mics, cabinets, rooms, and outboard gear. Impulse responses (IRs) are recordings of test tones created in the spaces or through the gear being modeled. IR reverb players compare these recordings to a theoretically dry version, and then apply the resulting variables to any audio you pump through them. Voilà— your guitar can sound as if it was recorded in the Taj Mahal. Or a sewer. Or through a $5,000 outboard reverb unit.

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