if (keyboard_check_pressed(ord('R')))
Pour les lettres.
Et pour les timeline c'est dans l'aide:
timeline_index Index of the time line associated with the instance. You can set this to a particular time line to use that one. Set it to -1 to stop using a time line for the instance.
timeline_position Current position within the time line. You can change this to skip certain parts or to repeat parts.
timeline_speed Normally, in each step the position in the time line is increased by 1. You can change this amount by setting this variable to a different value. You can use real numbers like 0.5. If the value is larger than one, several moments can happen within the same time step. They will all be performed in the correct order, so no actions will be skipped.
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en Tous Ensemble! Réalisons!