@is_playing_on()
this predicate returns true if the detection of musical event is simulated.

Musical event are simulated (opposed to detected by the listening machine) in fastforward mode (see @is_fastforward) and also in play mode. The play execution mode make a simulation of the normal functionning of an Antescofo program by providing a simulation of the events to detect. This mode is usefull to debug a prgram or to use the language as a kind of advanced sequencer.

See also @is_fastforward, @is_following_on, @is_paused, @is_playing_on, @is_running, and @is_stopped.