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The Monitor Model usually depends on the studio setup (hardware mixing desk), but also to some extent on the audio interface (zero- latency monitoring). Since a user may also use different interfaces (e.g. with a laptop), it makes sense to expose the monitor model preference in the engine-dialog. NB. It is not part of the engine-state (!), but still a preference.
Please see the Ardour web site at https://ardour.org/ for all documentation..
For information on building ardour:
https://ardour.org/development.html