If its a 'screech ' its an access Ti ' deliberate - lets release the ti early and get some cashflow in ' mistake . . . designed to eventually put them out of business and irritate Ti users to a point of dispare .If its a click it maybe just one of the faulty units in circulation you have . . . no one is really sure , ive heard a few people say that the digital drop outs and screeching and speaker blowing noises are part of a deliberate ' glitch ' patch bank .Others say the fact the 99% if Tis cant be used well in multi mode or with usb means its due to immoral and greedy businessmen who seen just want you cash .They basically bolted the Ti together and started flogging it and dont seem to have actually tested the Usb.Nice work access , always good to be reminded of what the arse end of human nature is - 'greed and selfishness' .Well done Access