Personnaly, I dont think that glue joint have a damping effect on string vibration since the glue we use are harder that the wood itself. I get more sustain from my multi-lam neck that my flat-saw p-bass neck and multi-lam neckthrought are realy popular for there sustain.
Here you will find some 3D simulation about the way a guitar react to vibration.
Philippe
glue hardness by itself does not equal sustain.make a hole body out of it how will it sound
Multi meaning many, and what types of wood ar we talikng about in this case
and keep in mind tah is a neck that has a fingerboard connecting the lams and screws
"Clamping" it to the body
and the other case is neck through wich is always better for sustain
wether its one or seven peices
If we follow your thinking, a one piece neck through will have better sustain? If you have better sustain with a 3 parts body, it's because you have 2 glued joint that make your structure stronger. It's the composite basic.