I had a crackle and pop noise coming from the BB30 bottom bracket on my 2012 Synapse. I removed the crank and found a little dirt and sand inside the shell. I cleaned out the shell and the bearing contact surfaces (on the crank and the bearings themselves). Then I greased the bearing contact surfaces and put it back together. The sound was gone. This was an easy job only taking about 15 minutes.

I did not remove the bearings themselves from the BB shell though. If the procedure that I performed did not stop the noise my next step would have been to remove the bearings and check and clean the BB shell and bearing surfaces where they meet, grease and put back together.

Have you pulled the crank and/or bearings and cleaned and greased everything?