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I am looking for an alternative to the finecast for Noise Marines's sonic weapons, and I am stuck between a few of the FW 30k weapon choices. I was hoping to get an idea on how the Volkite Charger, Volkite Cavlier, and Graviton gun work in the HH game, so that the models can be compatible and useful between both games. I don't want my Noise Marines to be wub-wub in one game, then flub-flub in the other. Aesthetically, I really dig all of them. Thanks for the help in advance!

Alternate sonic weapons you say?

http://www.forgeworld.co.uk/The_Horus_Heresy/Legiones_Astartes/Emperors_Children/EMPEROR'S_CHILDREN_LEGION_KAKOPHONI.html

Yeah, I was about to suggest the Kakophoni as well.
Volkite weapons are nifty, though. They're best against armies that don't have good armor saves, as every unsaved wound causes an additional hit. A Legion special weapons squad with Volkite Calivers are good at hunting light vehicles, too.
Perhaps the strangest thing with Volkite weaponry is their ranges. They don't use the normal weapon ranges (i.e. 12", 24", etc), as they're in multiples of 5 instead.

I really like the kakophoni guys, but they are aboslutely covered in Emperor's Children regalia and it would be far too expensive to go into them just for the weapons.
I do like sound of the kills cause extra hits rule from the volkite weapons. Calivers willl be my go-to it seems, as the versatility in target hunting is delicious.
How do the gravitron weapons function though?