I'd start with Limb savers and string leeches.

I had the same problem with My Mathews Q2 XL, after I replaced the string with a winners choice I got a lot of string "twang". Belive it or not Leaches did not help. I put 2 sets on my string and still had it. I finally put on some plain old cat wiskers. I found out something very important though. I really matters how they are installed. If they are put on loose where they just hang they won't work nearly as good. If they are tied on real tight where they form a nice tight ball they work better than anything else I've tried.
Trust me I want thru at least a dozen sets of leaches and I can notice a big diffence.
Good luck Jim

Try holding up your bow and hitting it with the palm of your hand. I've been able to locate noise from my bow like that. Just a thought.

Check every accessory or your bow to ensure that everything is tight. If everything is tight you may want to consider the nv system for your bow. They run about 50$ and will require that you breakdown the bow in a press but I think you'll find that this will reduce a significant amount of vibration before it reaches the riser and should help to reduce vibration noise.

Play nice. I took offense to that.