AiO (pronounced A-O) is a versatile Audio in/Out soundcard on USB.
It uses the standard USB devices so does not need to have drivers. Stereo/mono output with a volume control.
2 channel input with independent clip and level controls. Mic/Line switching allows you to record a sting direct in from a dynamic Microphone and line from an audio desk.
Isolating transformers and Earth lift of course for eliminating hum.