for anyone interested, François-Eudes posted a nice abstraction to achieve this "fadein/fadeout" thing, but on the C74 forum.
here is the link and its abstraction :
http://cycling74.com/forums/topic.php?i ... ost-125974enjoy
Olivier
fe.nocut~ :
----------begin_max5_patcher----------
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-----------end_max5_patcher-----------
Then the help file :
----------begin_max5_patcher----------
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-----------end_max5_patcher-----------