Add to cart Holy Grail – Acoustic IR Pack $14.99 Rated 5.00 out of 5 This Acoustic IR pack captures the incredible tone of Brian’s McPherson® Camrielle. These IR’s can be used in any hardware or app that accepts .wav IR files. Get the sound of a world class mic’d acoustic guitar direct. Includes multiple acoustic pickup options to accommodate a wide range of acoustic guitars and pickups. These are meant to make your acoustic guitar sound incredible. They are not designed to make an electric guitar sound like an acoustic.