Yeah its probably turbine surge thats making the sound. If ya really wanted a big silly loud BOV sound youd put the valve directly after the turbo, that way its getting instant pressure straight from the turbos air discharge. That might make a fluttery sound depending on the turbos RPM but itll be loud as hell if you have one of those horn type sneezers and its going to atmosphere.
Also depends on where ya put the valve too if ya have it pointing up towards your bonnet sound baffling stuff itll be quiet as, but if ya point it out sideways towards edge of the bonnet thatd make a difference too. Either way its all alot of effort for absolutely no gain whatsoever.
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