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We are risk averse when it comes to production audio. If you are forced to use an
AGC Disable technique because your camera does not have manual control, then
we are of the opinion that even if you choose to use the TONE approach, you
should abandon the camera’s right track, and only use the clean left track for
recording. Then use the PAN TO L switch to route any right channel microphones
(XLR-R or RING-R) to the clean left recording track. See the “Post-Production:
Removing Right Track” section for more details.
If you do attempt to use the right track, then the ~20KHz tone will also be recorded
with your audio on the right track. Even though this ~20KHz tone is inaudible for
most people, you should take the extra step to remove this tone in post
production. Your final product may get resampled by a compression algorithm
that you don’t control (YouTube, etc) and result in an aliased artifact of the tone
back in the audio band. See the “Post Production: Removing Tone” for more
details
With either the TONE or NOISE approach, you will use the METER in the HI
setting. The meter sensitivity has been pre-calibrated for a typical camera. If
further calibration is desired, then see the “Meter” section for more details, as
there may be exceptions.
Safety Mode – Noise
The NOISE setting injects a broadband uncorrelated noise signal into the right
recording track of the camera. This leaves the left track clean for recording:
As such, you will NOT be able to use the right track of the camera to record your
microphones.
If you have any microphones plugged into the right input channels (XLR-R or
RING-R), then you must use the PAN TO L switch to route those signals over to
the left output channel.
Although you sacrifice one recording channel, the NOISE approach is a much
more stable and repeatable technique for AGC DISABLE.
Left Track
Right Track
(clean audio)
(disable signal)