B-6
Appendix B
B.1.3 Gain Tracking Procedures ..................................................
The suggested setup for two consoles which are sharing the same racks is as follows:
a) One operator will be responsible for adjusting the analogue gains on the racks (Recommended):
1) One console should fully connect to the racks using the System / Consoles and Racks panel's Full Connect button for the Optocore
racks.
2) The operators should agree on and set a level of analogue gain that provides enough headroom for the required application.
3) The second console should connect to the racks in Receive Only mode to ensure that it doesn't send its own current gain levels to the
racks.
4) Gain Tracking should be switched on for the console that is in Receive Only mode consoles for all the channels that are being shared.
5) Both operators should use their own console's digital trims to adjust their overall operating level from this point onwards.
If the analogue gains need to be changed, only the console that is in Full Connect will be able to do this but the second console will be not
be affected by these changes as it has its Gain Tracking switched on.
b) Both operators want to be able to control the analogue gain on the racks:
1) One console should fully connect to the racks using the System / Consoles and Racks panel's Full Connect button for the Optocore
racks.
2) The operators should agree on and set a level of analogue gain that provides enough headroom for the required application.
3) The second console should connect to the racks in Receive Only mode to ensure that it doesn't send its own current gain levels to the
racks. This console may then do a Full Connect to the racks.
4) With both consoles in Full Connect, Gain Tracking should be switched on for both consoles for all the channels that are being shared.
5) If either operator changes the analogue gain there will be no overall level change on either console as the digital trims will always
compensate for the change in analogue gain.
Note: If either operator wishes to change the analogue gain and not have their own console's digital trim compensating, they
should temporarily switch off Gain Tracking on the required channel, make the gain change and then switch gain tracking back
on again.
B.1.4 Gain Tracking and Cues .....................................................
In a FOH and Monitors system, a great deal of care must be taken if analogue gains are to be changed with Cues. There are a number of
methods of doing this but as the following points illustrate, there are several things to consider.
Note: Analogue gains are included in the Cue Input Routing Scope and digital trims are included in the Input Controller Scope.
It is intended that one console will not have analogue gains in any of its Cues' scopes. This prevents it from sending any rack commands
at all and therefore it cannot change analogue gains with Cues.
A similar situation could be created by making the console Receive Only for rack control but this will also prevent manual analogue gain
changes.
In either case, the other console is then in complete control of Cue gain changes.
When a session is loaded it starts in Isolate, so if you go to Receive Only then Full Connect you can join the rack sharing without
making any gain changes. If you are responsible for the analogue gains, it is likely that you will want to go straight to Full Connect after
load session.
Subsequently, both consoles can be in Full Connect at all times; this way if either operator spots an over (or under) they can manually
adjust the analogue gain on either console and if Gain Tracking is on for both consoles the balance will not be disturbed.
Note: Problems may occur if both consoles are using Cues and they have digital trim changes in their Cues.
In this situation, Cues must be stored at the same time on both consoles so that the analogue gain changes on the controlling console will
be reflected in a stored digital trim level on the other console which is recalled with the firing of the Cue.
The console that is not controlling analogue gains should normally have Gain Tracking switched on to enable its digital trims to compen-
sate for the other console's analogue gain changes. This system will work correctly but if the digital trims are subsequently changed with
an in dependent Cue then the automatic adjustment may be overridden and unanticipated overall levels may result.
Suggested methods:
1) Do not change analogue gains with Cues from either console.
This is the simplest method and involves removing Input Routing Scope from all console Cues.
Both consoles can be in Full Connect so that either operator can adjust analogue gains manually.
Gain Tracking can be switched on for both consoles to ensure that neither is affected by manual gain changes that are made by the other.
Digital trim changes can be made manually or in Cues on both consoles as these changes are completely independent of the other
console and cannot affect it in any way.
Note: The drawback of this method is that by removing Input Routing Scope from all console Cues, the input socket selection
cannot be changed with Cues.
2) Only change analogue gains with Cues from one console.
If there is a requirement to change input socket routing and/or analogue gains with Cues then only one console should control the gains.
The second console should have either:
a) Input Routing Scope removed from all of its Cues - this assumes that there is no requirement to change input socket routing with
Cues.
OR
b) It should be in Receive Only for rack commands so that it cannot send its own analogue gain changes but can still have Input
Routing Scope on and therefore change input socket routing with Cues.
Gain tracking should be switched on for the second console so that unforeseen gain changes on the first will not affect its overall balance.
Gain tracking may also be switched on for the first console but this is not really necessary as the second console will not be controlling the
analogue gains at all.
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