We also recommend you to use this driver when you want to try buffer size setting lower than a class compliant driver.Usually setting the buffer size to a higher value can eliminate the problem however, if you encounter this issue when using the class compliant driver, and setting the buffer size to a higher value does not resolve the problem, please try the USB Audio Driver. In some cases, depending on conditions or the specification of the computer, a drop-out noise in a recorded audio file can be produced as a result of an interruption in the signal flow.

If you are using Mac OS X v10.8 or earlier, Use the 'Yamaha USB Audio Driver'.