new hand built wheel - loud spoke shivering sound when bounce unloaded
New wheels often make noise when the spokes settle. Avoid leaving tension in the spokes while building the wheel to avoid some of it.

Read http://www.sheldonbrown.com/wheelbuild.html#torsion

I don’t know the English word for the German „Abdrücken“, but it basically means pressing the wheel downwards like this with considerable force all around the wheel and from both sides. It will relieve the spokes facing downwards, releasing their tension and you’ll hear lots of *pling* sounds from the spokes when doing this. After doing that you’ll probably have to re-true. Rinse and repeat. If you do that thoroughly enough the spokes shouldn’t move any more during usage and you shouldn’t hear any *pling* sounds on your first ride.

A tensiometer is a good investment.