Calrec SUMMA, User Manual

Page: 142 / 198

FIGURE 2 -
VCA HIERARCHY
Masters and Paths
When a fader becomes a master and it has a path attached, that path becomes a slave of the master fader.
The level of the slave path can be altered separately to the master fader level:
1. Push the master fader’s ACCESS button to see the fader jump to the position of the slave path.
2. With the ACCESS button held, move the fader to change the level of the slave path.
3. Release the ACCESS button to see the fader jump back to the master position.
Nulling Indicators
Nulling indicators appear within fader displays and are used for the following:
• To indicate when the combined level of a slave fader and its master are off the scale of the physical fader. The ‘down’
nulling indicator lights when the combined level is below -99.9 dB and the ‘up’ nulling indicator lights when the
combined level is above +10 dB.
• To indicate when the actual level of a VCA slave fader is higher or lower than the actual level of the fader, when VCA
slaves are prevented from moving along with their master faders.
• If both nulling indicators show at the same time, this indicates that the master fader is below -50 dB and so the level
of the slave cannot be altered. This has been put in place for safety as making alterations at such low levels would be
likely to produce inaudible results.
142 SUMMA
Networked Audio Production System
PROCESSING