This addon is only available when hosting your own server such as local server, L4D2 dedicated server or single player offline game. It's server-side addon so won't take effect on official servers.

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~Available scenes still won't work, You have to install a way better accessory, details about installation and link in the changelog list below;
~This is raw build;
~Unused l4d2 scenes available only in English. (Subtitles was translated.)
~Modification has plenty of scenes, in certain community campaigns, "Sound precache table overflow" may happen and crashes the server while loading a map, but official campaigns won't happen such problem.

~Different version for l4d1 is at this website~

So what's in this modification different or new?
(As of April 9, 2018)
Here is extended and/or amended by me rules and replicas in various scenes, and standard vocalize-menus (in script code), fixed old and new bugs. Added more extra situations or modified original ones, increased chance to fire speech, so You can hear hidden stuff oftenly, restored triggers on Sacrifice (Francis jokes while he searching boats) and Crash Course (final speach when truck's down) campaigns, also directions, like "Let's go left" or "To the bridge!". Modification merged with:[i]L4D1;2 & ε(Epsilon) Modified talker[/i] from Morning Nine Nine. Also as a bonus restored unused special infected lines; music tracks with other scripts: "Infection", "Intro_CS", "Easy germ", "Snare Horde", "Violin Slayer", "Fairground germ", "Banjo" and "Walking Dead"; finally written special menus for You, which You can bound to the keys, from keyboard options in the game.
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Particular thanks to:
DeathChaos25 - Fixed talker bugs with plugins.
UbiSergei, ChocolateCat - Offered a better way to install sound scripts.
Morning Nine Nine with X8G7 and other artists, 
But especially, You, dear User, who always waiting for updates, improvements and shares new ideas.
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~Information about progress, game-code differences and installation, please, check inside changelog list.