Vision and Studio Vision Pro Version 4.1 Manual ... - House of Synth

PART 3: The Acadia Audio System
Whenever launching Vision, or opening a
new file, the default fader values for audio
channels correspond to 0 dB—and, this
actual fader value will vary depending on
your Maximum Loudness setting.
Smooth Audio Controllers
If you are curious as to how the range of
fader values is mapped to dB values, see
Table 1, which lists these values for each
of the four Maximum Level settings.
Fader
Value 0 dB +6 dB +12 dB +18 dB
127 0 dB +6 dB +12 dB +18 dB
90 -6 dB 0 dB +6 dB +12 dB
64 -12 dB -6 dB 0 dB +6 dB
45 -18 dB -12 dB -6 dB 0 dB
32 -24 dB -18 dB -12 dB -6 dB
22 -30 dB -24 dB -18 dB -12 dB
16 -36 dB -30 dB -24 dB -18 dB
11 -42 dB -36 dB -30 dB -24 dB
8 -48 dB -42 dB -36 dB -30 dB
6 -54 dB -48 dB -42 dB -36 dB
4 -60 dB -54 dB -48 dB -42 dB
3 -66 dB -60 dB -54 dB -48 dB
2 -72 dB -66 dB -60 dB -54 dB
1 -78 dB -72 dB -66 dB -60 dB
0 - inf - inf - inf - inf 64
Table 1: Mapping of fader values to dB levels
Figure 11.6: Audio Preferences, Smooth Audio
Controllers
The Smooth Audio Controllers section
lets you smooth out rapid changes in
volume and pan for audio, thereby eliminating
unwanted clicks and pops.
The Fade duration value sets the length
of the smoothing ramp used when
encountering abrupt changes in volume
and pan. You can manually enter a value
between 0-200 msecs, or you can click on
one of the four preset buttons, which
include None (0), Sharp (50), Medium
(100), or Smooth (200).
For instance, Figure 11.7 displays an
audio signal with abrupt changes in
amplitude:
66
100 ms 50 ms
78
100 ms
Sharp Changes is amplitude
can cause unwanted clicks and pops
Figure 11.7: Abrupt amplitude changes for original
audio envelope.
68
88 Opcode Systems, Inc.