How to Troubleshoot AmpliTube iRig

Remove your instrument cable from the iRig 1/4-inch input jack.
Insert a brand-new instrument cable into the jack. A faulty guitar cable can create sounds similar to those of a faulty interface, namely crackling and hissing. Since your guitar cable experiences much more movement than the iRig adapter, it's more likely to experience wear and tear. By replacing the cable with a new one, you eliminate a faulty cable as a cause.
Slot a razor blade into the groove along the side of the iRig casing. Once you've established entry, slide the blade along the edge and gently pry the top half of the casing away from the bottom half.
Inspect the interior. If you spot any loose or completely disconnected wires, these are the most likely cause of intermittent sound.
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How to Change the Serial Number With the Mac OS X Terminal Command

Open a terminal by clicking the “Finder” icon on the dock, clicking “Applications,” double-clicking the “Utilities” folder and double-clicking the “Terminal” icon.
Type the following command into the terminal window, replacing “Serial-Number” with the serial number you want to use, separated by dashes, and “Name” and “Organization” with the name and organization associated with the serial number. The name and organization are optional.sudo serversetup -setServerSerialNumber Serial-Number Name Organization
Type your password at the password prompt and press “Enter.”
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