A system and method for analyzing a signal to identify one or more candidate frequencies that may have a potential feedback problem. A device for arranging a vial includes an arm member 150 for sandwiching one vial 1 and a carrying means 58 for carrying the vial 1 sandwiched by the arm member 150 to a vial arranging section 202. The fall tillage coulter tills soil in a zone that is approximately 7 to 9 inches deep while the spring tillage coulters till 2 to 3 inches deep.