CONFIG_VARIABLE (float, video_pullup, "video-pullup", 0.0f)
CONFIG_VARIABLE (bool, show_summary, "show-summary", true)
CONFIG_VARIABLE (bool, show_group_tabs, "show-group-tabs", true)
+CONFIG_VARIABLE (bool, external_sync, "external-sync", false)
+CONFIG_VARIABLE (SyncSource, sync_source, "sync-source", JACK)