yes perfect way to put it , and yes im a noob =/ but we learn something new everydaythat's not even close to what it means, or how to do it..
1. loosen the nut
2. adjust the screw (in = TIGHT, out = LOOSE).. to further expand on that, the tighter the tension is set, the more pressure it takes to open the BPV.
3. once adjusted to where it needs to be, tighten the nut to keep the screw from moving during time/vibration.
Note: a BOV set too loose, or 'soft', can actually sit 'open' during high-vacuum situations, such as idling, or light-throttle cruising.
Summary: the screw/adjuster does not make a BPV or BOV louder or more quiet, it makes the piston/diaphragm easier/harder to open.
The volume is determined by how much "boost pressure" is being expelled/rerouted, as well as the actual design if the BPV/BOV. 5psi will be a lot softer sounding than, say, 20psi.
Think of yourself exhaling.. normal breathing is very quiet, because a minimal amount of 'pressure/volume (as in mass, not audible)' is being expelled. After a sprint, your breathing is much louder, because you are now expelling a greater volume/pressure of air.