Calrec Apollo - LtRt; LoRo downmixes

CALREC Putting Sound in the Picture 113
LtRt / LoRo downmixes
For each 5.1 main bus, the stereo down
mix can be chosen to be LoRo or LtRt.
LoRo maximises mono compatibility
at the expense of losing the front rear
separation that a Dolby ProLogic decoder
could recover when using an LtRt
downmix.
Note that because the number of
main outputs is halved at higher
sample rates the number of available
LtRt downmixes is also halved so
only 8 Lt Rt processes will be made
available at 96kHz.
Bus routing
Apollo has a very flexible bus structure
allowing many routing possibilities:
• Channels can route to Groups, Auxs,
Tracks and Mains.
• Groups can route to other Groups,
Tracks, Auxs and Mains.
• Mains can route to other Mains.
• Tracks cannot route to any other bus.
• Auxs cannot route to any other bus.
Pre-fader Aux send cut options
Path sends to Aux output buses can be
configured to cut under certain conditions,
such as the send path’s fader being open
/closed and/or the path being cut.
These options are set from the
>Operate>Bus Config>Auxes page of
the main application, as shown in Fig 4.
The options are set on an output basis,
but it is the send from each path feeding
the outputs that are independently cut
depending on the status of each path
routed to the aux output.
For example, if ‘Pre Fader Send cut when
fader closed’ is selected for Aux output 1,
the pre-fader sends from each path routed
to Aux1 will be muted whilst their fader is
closed.
FIG 4 - MAIN APPLICATION, OPERATE>BUS CONFIG>AUXS SETUP SCREEN
As soon as the fader is opened, the path
will send audio to the aux at pre-fader
level.
Pre fader sends whose faders are open,
as well as any paths feeding post fader
will still be passing audio to the Aux1
output.
The options available for muting sends to
each aux output are:
• Pre-fader send cut when channel
cut (or not ‘on’ if fader have path On
buttons rather than cuts).
• Pre-fader send cut when fader closed.
• Pre-fader send cut when fader open.
• ‘Bird-Beater’ - Pre-fader send cut when
fader open and not cut. The send is
active only if fader closed, or path cut
(or not ‘on’ if on buttons fitted rather
than cuts).
The pre-fader cut when channel cut option
can be selected in combination with either
the cut when fader open or fader closed
options, however other combinations
would conflict with each other and as
such, selecting one will cancel others.
FIG 1 - BUS RESOURCES FOR APOLLO AT 96KHZ
Bus Type
Mono Resources Available Max Number Configurable Buses
Mains & Groups 64 8 Mains, 24 Groups
Auxes 24 24
Tracks 48 48