well i got the new limbs in today and was starting to tune it when i heard like a metal cracking sound i heard this before i got the new limb could it be one of the bearing in the cam? i have had thi happen before and it was a grip and my friend bow had the same problem but we put some oil in the bearing and the limb pockets and the problem went away.....

Check and make sure the limb pocket lock bolts are tight. Not sure if noise would result but, check to see if the cable rod is tight. Maybe someone can listen as you draw, to isolate the area of the noise.