The admin menu enables RTP-MIDI service. This is saved in the snapshot, so loading a snapshot with RTP-MIDI enabled will enable the RTP-MIDI service.
The chain options, MIDI Input menu enables RTP-MIDI input to a chain. (The service must already be enabled in admin menu.) This is saved in ZS3, so loading a ZS3 will recall each chain’s RTP-MIDI routing.
Similary, each MIDI chain’s output may be routed to RTP-MIDI which is also saved in ZS3.
Note that when the snapshot is loaded, ZS3-0 is loaded which is the state of the system when the snapshot was saved.