When observing a channel and a script is running which changes the level of the zone or group being controlled by a channel the channel may not appear to update. This can occur if a fade time is set for the zone, group, or channel control.
The channel updates according to the target level instantaneously, not over time as the operation is fading the levels.
A channel is assigned to control zone 1.
A script sets the zone level to 100% over a fade time of 30 seconds.
The channel controlling the zone is updated to the target level of the operation in this case 100%, if the current level is 0%, the channel slider will not update as the zone level is faded over time.