My experience with this problem:
1) First ease all your running rigging
attached to mast and boom ( halyards, topping lift
pole lift) and listen…….
2) Now harden (trim/tighten) up this rigging
3) If the sound is different/ disappears make adjustments to running rigging
- try putting halyards out on pulpit / pad eyes, attach your jib
halyard to the bow roller and harden up.
If the sound is the same/ doesn't go away completely, call a rigger to discuss potential for creating stress fractures in spars, shackles, tangs etc- noise
is energy and if its not doing something positive it just may be doing something negative to your boat.
I had this problem and rigged the jib
halyard to the bow anchor
roller, hardened up the jib halyard and the vibration disappeared.
Some sailors have attached a 4 ft. single
braid > 3/8 spectra line with snapshackle to their bow and attach their Jib halyard to it- we call this a "fractionator" and it is used on racing
and cruising boats to move the tip of the mast forward when flying the spinnaker - don't forget to ease your backstay.
Good luck- CRR