From Derek Icelord:

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This mod replaces all of Bain's dialogue with short (0.8 seconds at maximum) bubble sounds. Important audio such as Rats day 1 ingredients, sniper alerts, inspectors, escape types, and other useful dialogue is intact. The radio click sound is also untouched, as that's an all or nothing proposition.

Why do I call Bain a goldfish? Because that's what he is! Bain is a mutant goldfish. Think about it...

That's why he counts every bag you throw into the van. He has to relearn his numbers because he forgot from the last time. He constantly reminds you about the thermal drill because he forgot he just reminded you. On Shadow Raid, he forgets that you've thrown loot into the other drop points, so he thinks the first bag you chuck in the van is "a good start" every time. It's also why an alleged criminal "mastermind" can't remember how to cook meth, and uses Ask Jeeves instead of Google to find the information.

Some of the common files aren't patched properly, notably Bain's conniption about dead civilians. Sadly this will probably not change as I can't decode (and thus listen to) over 2,000 files.
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Still not enough? There are LUA files and codes that can mute Bain for good! I can't post them here of course, but you can always send me a message if you really want that parasite to shut his trap.