(Ted Harding) wrote:
/snip/
[A] I can bite the bullet and very gently try a line-in input. In which case: Do people have good practical advice on how to proceed carefully so as to avoid zapping anything?
The safest way to proceed would be a (line-level) feed from a headphone outlet into the microphone jack - which is also line-level, or should be. The output of this ought to be adjusted by the volume control, so you can work up to a sensible level.
or:
[B] I can get one of those USB sound cards (which should be safe). In which case: Where's a good place to look, and which are good ones? (Oh, and would Debian readily recognise it?).
First I've heard of them too, but filed in the noddle for future reference.