While riding use the process of elimination.
Lightly apply each brake one at a time. Does this effect the issue. Yes, adjust the offending brake. No....

Slowly shift each derailuer, Does this effect the issue? Yes, adjust the offending derailuer or cable. No....

With the bike stationary lift the front wheel and spin it. Do you hear the noise? Yes, figure out where it is coming from and fix it. No...

Lift the rear wheel and spin it. Do you hear the noise? Yes, figure out the source and fix it. No...

At this point if you have not found the noise source you should probably call an Exorcist.