i just had this problem with my afx. thought the units analog out was fried so i ordered a ballanger 500v2 and same thing. opened a ticket, mailed the interface and pro set in and just got it back. they replaced the proset under warranty as the said it was the culprit. will be tommorrow night before I can hook it up and see. turn around was one week. they send a next day shipping label and return is also next day air. gotta say im pretty pleased as long as this doesnt become an common occurance