How does Recaller record phone calls, specifically the "other party" -- i.e. does it simply record whatever your N900 microphone picks up (thus, the louder, the better), or does it get input (of the other party's voice) from the system directly?
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Read file "/usr/lib/hildon-desktop/recaller.py". It seems to me that, when recording a phone call, it combines microphone for your side (and amplifies it), and system for the other party.
Best wishes.