Sony PXW-FS7 Quick Reference Manual page 76

H. Audio Recording
H1.2 The correct input reference levels for the type
of external audio source you are using is selected by
switches on the right side of the camera body. In addition
if using an external microphone that requires +48V
Phantom Power this is enabled by selecting "Mic+48v".
H1.3 The recording levels for audio channels 1 and 2 can
be controlled either automatically or manually using the
level control knobs on the left side of the camera body.
The recording levels for channels 3 and 4 can be set to
automatic or manual in the menu
(MENU: Audio – CH3 Level Control/Ch4 Level Control)
and (Audio – CH3 Input Level/CH4 Input Level).
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