Can anyone tell me why my recordings (optical line in from Sat Tv) sound a little tinny with that "digital echo" almost like recording from a poor internet connection?
Without listening to a sample some guesses:
Are you recording in mono or stereo? Mono recordings from
stereo TV sources often have phase problems that sound very tinny.
If your recording is stereo, try to play back just one channel.
Also, if you are recording into mp3, check the bit rate or do some
tests in wav-format.