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auto fade-in
auto fade-in n. 
/ˌɑdoʊ ˈfeɪdˌɪn/ a facility on a video camera, music player or recorder, etc., which automatically fades in an image or the volume; cf. fade-in at fade n.1 2.
Brit. /ˌɔːtə(ʊ) ˈfeɪdɪn/
, /ˌɔːtə(ʊ) ˈfeɪdɪn/U.S. /ˌɔdoʊ ˈfeɪdˌɪn/
, /ˌɔdoʊ ˈfeɪdˌɪn//ˌɑdoʊ ˈfeɪdˌɪn/ΚΠ
1970 N.Y. Times 6 Oct. 14 (advt.) Become a professional movie maker with the Konica Super-8... Automatic film speed..setting, Auto fade in/fade out, [etc.].
2009 Radio (Nexis) 1 Apr. 58 This professional CD player plays and records standard CD-R and CD-RW discs. Other features include..auto track increment, auto-cue, auto fade-in and out.
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