You say that you get an echo when you unmute the line-in and let the wave unmuted then I deduces from it that the
radio is passing well into winamp because without it you should not have echo.
Are you sure that you unmute only the volume of the line-in and let the recording source line-in really unmuted ?
You should see two line-in slider in the original mixer of your
sound card, one in the volume device and the other in the recording device, unmute the one who is in the recording device and mute the one who is in the volume device.
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