if you are mixing down to a casette tape from VCR tape and dont want noise, first of all have clean heads on the VCR and casette deck, second you probably want to be using quality VCR tape and casettes tape. i've had good experience using Fuji ZII for the casettes tapes. for some reason they just sound amazing, i have Kenwood casette deck, could help. but they dont loose quality from whats coming in.