By default, the attenuators are not activated with a 24V switching input for the MPS-8Z but it is possible to enable. It can be enabled by accessing the root menu following these steps:
Configuration/ACSI Devices/Install (add MPS8Z)
Configuration/ACSI Devices/ Mics Config/ Select ACSI/ Override (enable or disable the option to activate the 24V input in the override when calling the particular zone with the MPS8Z).
For the VAP-1 it is not necessary to enable any special configuration, the device is configured by default.