Sony DCR-PC330: how to record audio from external (line) s..

Hello,
I've just bought a Sony DCR-PC330E and I'd like to ask if there's
anybody who knows if it's possible to record audio with a cable
connected to an external source and how.
In particular I'd like to record small concerts taking audio from mixer,
excluding (of course) internal mic.

Unfortunately I can't find any reference on the manual or on search engines


Thanks in advance

Regards

Fabio