I discovered that due to impedance mismatch ---> the output headphone jack of a radio shouldn't be used.
I was referring to attaching the output headphone jack of a radio
to the microphone input of the external USB sound card.
Normally you don't have problems with the line-in of regular sound cards.
My Sony receiver has a special line input port for portable mp3 players like Apple ipod.
Sony says that it adjusts level of the audio better than the other line-in ports.
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