in a village that i like and i set my house next to, i could hear the cave ambiance. i spent two day lighting up the caves and ravines. i finally looked up how to x-ray [sorry] and found  [1 by 1 blocks] had spawned under the ground causing the ambiance to go off.  

idk how to fix it but maybe the ambiance needs a 4by4 block of open air  with a light below 8%