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Would it be possible to use the Helbrute with the sonic weapons with the formation helcult? This would be really tasty as it would let me ignore cover whilst still being protected with a nice 3+ cover save

There is no Helbrute with sonic weapons

but there is a dreadnought?

There is a Sonic Dreadnaught, yes, but that's not a Helbrute. Different name, different unit.