Studer OnAir 3000 Operating Instructions Manual page 106

OnAir 3000 Digital Mixing Console
either for the 'Subgroup, HP/LP, Ducking' option or for the 'VCA master'
option; it will be reflected to the other.
Notes:
Any group output can be assigned to any physical fader on the desk.
The fader value adjusted with the rotary encoder (or the mouse) and the one
of the physical fader, if assigned, work in parallel, it is a kind of 'the last wins'
circuit. This means that moving the physical fader also effects the bar graph
on the screen; the other way round, however, a change with the rotary encoder
or the mouse sets the fader into takeover mode, because the new (electrical)
fader value and the fader's (physical) position will then be different. This
does not apply, of course, when using the optional motor fader modules.
If the '0 dB on top' fader scale mode is active for the current user, the electri-
cal fader value can be set higher than 0 dB with this rotary encoder. When
touching the fader button (on motor fader modules) or slightly moving it (on
non-motor fader modules), control can be taken over again by the physical
fader; there will, however, be an audible level jump in such a case.
For VCA masters, the additional DSP card required for sub-groups is not
required. If it is not installed, all sub-groups remain in VCA master mode.
'Hybrid Subgroup' Mode
This special arrangement, available in SW 5.0 and later, allows a combina-
tion of VCA control and audio sub-group mixing. The purpose is for studios
that use N-X busses for external audio returns (such as telephone hybrids and
satellite lines). This signal flow is shown in the diagram 4 on the following
page. If the inputs shown as microphones are in fact remote sources it is sen-
sible from a mixing point of view to sum all these remote sources on a single
group fader so that overall limiting, EQ and fader level control can be applied.
In order to avoid contributors hearing their own voices it is not possible to
use the group output to feed the N-X busses (as shown in diagram 3). N-X
bus sends need to come from the input channels directly into the N-X buses.
However if a normal group master is used, when closing the group fader the
signals that are not on air are still added to the N-X busses, and are thus heard
by contributors listening on remote lines. By using a hybrid group, which by
VCA controls the input channels, closing the group master also closes all the
slave input channels' feeds to the N-X busses, but still allows audio summing
for EQ and dynamics.
Operation 5-43
Document generated: 10.10.14 SW V6.0