Ayyid1 is an Ayyi service that provides composition and audio/midi rendering functionality.
It is a daemon that is a thin layer built on libardour with the addition of some IPC to communicate with its clients. All credit for libardour goes to Paul Davis and the Ardour team.
It offers all the backend functionality of Ardour and will read and write Ardour (v3) project files.
If you run an Ayyi program that requires this service, ayyid1 will be automatically launched in the background.