Did that Dolby B noise reduction thing ever really work?
Dolby noise-reduction system - Wikipedia
Disney read along cassette with Dolby. Is Dolby usual for this type of voice recording? Have you people seen this before? This is a Spanish edition made in Mexico from mid '90s. :
Can you play a non-Dolbyised cassette with Dolby NR on? - Quora
File:Prerecorded cassette (Kronos performs Glass) with Dolby SR and Digalog markings 02.jpg - Wikimedia Commons
Boston Third Stage Cassette Tape Dolby Mcac-6188 Dolby HX pro - Etsy Italia
Tascam 112R | registratore a cassette | OLDSTORE
Chicago-Holland - Cassettes Toronto
Thomas Dolby Cassette Tape 80's New Wave She Blinded - Etsy Finland
Cassette tape comparison: No Dolby NR, Dolby B & Dolby C - YouTube
SONY XK-8D Car Stereo Cassette Player Dolby NR Japan Vintage | eBay
Dolby Nr C Demonstration Tape (Demo, Cassette) - Discogs
Derek And The Dominos Layla Cassette Tape Dolby Polydor CRC p4 - Etsy Italia