Fu la variante del 4 piste Muntz Stereo-Pak, commercializzato da Earl "Madman" Muntz in California nel 1962, già come il 3 piste Fidelipac. ###>This was an eight track variation of the four track Muntz Stereo-Pak tape cartridge, marketed by Earl "Madman" Muntz in California in 1962, itself a version of a 3-track system, Fidelipac.