文档介绍：INTRODUCTION TO MIXER AUTOMATION: PART 1 Page1
INTRODUCTION TO MIXER AUTOMATION: PART 1
Paul White introduces the concept of VCA and
moving-fader mixer automation in the first part of a
short series on automated mixers and their
applications.
Until the late '70s, virtually all multitrack music mixing was
done using analogue consoles with no automation at all.
Fader levels had to be changed manually during a mix, and if
the mix plicated, additional people would be
conscripted to help. One wrong fader move and you either
had to start the mix again from the top, or resort to splicing
together the best bits from several mixes using razor blades
and sticky tape. Obviously this was restrictive enough to prompt someone e up with
the idea of building a mixer where the fader levels could be automated in some way.
The two main ways of automating fader levels on analogue consoles are either to use
motorised faders, puter control, that can reproduce the fader moves you made
earlier, or to use voltage controlled amplifiers (VCAs) controlled by standard manual faders. In
the VCA system, no audio passes through the faders -- they're just used to produce a DC
voltage that is read by the puter to determine the fader position. By contrast,
most moving-fader systems route the audio signal through the fader in the conventional
manner.
Initially the VCA a