On attempting to disable `sound.target` in a Nanopi Neo3 I noticed that both `alsa-state.service` and `alsa-restore.service` use the same `ConditionPathExists=!/etc/alsa/state-daemon.conf` (apparently called Card State Management Schemes). This contrasts with the unit files on my host system, with `alsa-state.service` using `ConditionPathExists=/etc/alsa/state-daemon.conf` and `alsa-restore.service` using `ConditionPathExists=!/etc/alsa/state-daemon.conf`. What is the reason for using both services within the same scheme?
