A small number of Mac OS X 10.8 Mountain Lion customers have reported problems with noise or distortion occurring intermittently when recording or playing back audio over USB with Line 6 devices. Mac Driver 7.2.4 implements several changes which should improve these issues on all Line 6 USB devices.
If you continue to have problems with audio using our latest 7.2.4 driver for Mac OS X, please submit a support ticket at http://line6.com/support/tickets/add.html.
Line 6 Customer Support