Hello, i use an old Mac with iOS 10.13 High Sierra with Garage Band software and a Presonus Audiobox usb (purchased in 2006) as the interface. So long it funcioned well. Now i cannot properly hear my instrument through interface, the sound is extremely week regardless the volume buttons positions and correct sound setup.I cannot update my Mac’ s op system to Mojave anymore. Is there anything a can do, update something or do i need to get new interface/ computer?