Patzag, by any chance do you have another recording interface, along with your AXE II usb, plugged into your mac? If so, you may want to try removing the Axe II usb for a quick test. I find, in logic 9 even when i have selected my other interface in preferences, in my case an RME Fireface 800, logic still holds on to the AXE II even though the preferences tab indicates RME Fireface. With input monitoring enabled i get swirling echoes and/or major distortion. I have to completely remove the USB cable from the Axe II to eliminate the weirdness.