sound@gentoo.org Gentoo Sound project libdolbyb treats audio recordings to apply or remove something similar to what Dolby B noise reduction codecs in high-end tape recorders do by emulating in software the electronics of a real Dolby B unit. It translates dolbybcsoftwaredecode.sf.net from Pascal into C giving a generic C library and a command-line tool and is used as a new SoX effect in sox_ng sox_ng/libdolbyb