Another method of creating free iPhone ringtones from standard AAC files has been discovered by the same MacRumors forum member who found the original method last week. The new process is currently slightly more technical, but appears to be more dependable. Roth Capital’s Jay Srivatsa claims that an audio codec chip from Cirrus Logic has been designed into the iPod Classic, replacing a part from Wolfson Microelectronics, reports Barron’s.…