[Ardour-Users] Automation from analog mix?

David Kastrup dak at gnu.org
Sun Dec 19 10:19:57 PST 2010

Arnold Krille <arnold at arnoldarts.de> writes:

> You are over-simplifying things. For echo-cancellation its a
> time-dependent linear system (not even frequency dependent).

Since when?  Reflections rarely do you the favor of happening with
constant frequency gain and phase-linear.

> Anything you want to extract as automation from a finished mix (and
> the raw signals) is non-linear. Automation in todays systems is more
> the just volume and panorama. And even if you are just interested in
> the volume, the non-linearity of eq,

eq is linear.

> gate, compressor and other in-line effects can easily disturb your
> fine linear algorithm...

Sure: if you have control over the setup, picking up the aux sends would
certainly smart if you have ugly things in there.  However, gates and
compressors translate readily enough into automation.  You just lose
their signal-dependency in the process, so if you fiddle with the aux
sends in remixing, the presentation of the gates and compressors will
not notice.

Troubling nonlinear effects are amp simulations and sophisticated
reverbs, leslies, distortions and so on.

David Kastrup

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