@is_stopped()
true
if the Antescofo system is
idle, waiting for a command or for an input message.
This predicate always returns true in a program. But it can be false if
used in an expression evaluated using a ::antescofo
antescofo::playstring
command.
See also @is_fastforward, @is_following_on, @is_paused, @is_playing_on, @is_running, and @is_stopped.