Low level noise introduced when exporting 'silent' audio track
If I record a few seconds silence (i.e. no mic or other sound source even plugged into my soundcard), then drag the recorded audio file from X1's track view straight onto my desktop and open it in something like Soundforge, it shows (correctly) that there is no signal in the silent recorded file.
But if instead of dragging it from track view, I use X1's Export Audio, then open it in Soundforge I can see there is now a very low-level signal present (a very quiet hiss that peaks at about -84.3 on the dB meter). You can only really hear it on headphones as a very slight hiss if the volume is turned up loud, and I suppose practically speaking it's not likely to be much of an issue (although I work with a lot of filmmakers and TV shows etc. so if I have silence in a track I do expect it to be complete silence in case it gets amplified during mastering).
But I'm just wondering why exporting audio might introduce this issue. There's no effects or any other processing involved, just exporting a completely silent audio track.