CHAPTER 9 |
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INPUT>UNDO MENU
9
Input > Undo Menu
What Exactly Is Undo?
In order to understand how to best use Undo, it is helpful to understand exactly what it is and how it works.
Undo is actually two separate processes - a de-clipper and a multiband expander – which work together to “undo”
the poorly mastered, hyper-compressed and clipped audio found on so many modern CD’s.
Note:
The de-clipper works most effectively when using Omnia.7’s digital inputs. Regardless of whether
your use the analog or digital input, the incoming audio must not be equalized or pre-processed in
any way. This means NO leveler, neither wideband nor multiband. If the possibility of clipping the
STL at the studio is a concern, simply turn down the input level to the STL and use Omnia.7’s Input
Gain control to compensate. Omnia.7 will also happily boost low input levels automatically.
Take a look at the two waveforms below, captured using Omnia.7’s built-in oscilloscope. The top window shows
the damaged source audio. The bottom window shows the same audio after it has passed through the de-clipper.
Notice how the peaks that were clipped during mastering have been restored by the de-clipper.
Note:
The oscilloscope gain was kept at the same level for comparison purposes, but Omnia.7 has
sufficient internal headroom, and the illustrations that follow do not suggest that the audio is being
clipped again by any portion of “Undo”.
