First, select a pattern in the pattern editor by clicking on its name in the tree list at the bottom of the editor. Next, calling Effects > Insert Pattern inserts the currently selected pattern after the current selection, or at the beginning of the piece if no sounds are selected. Calling repeatedly this action lets one create rapidly a regular beat or accompanying voice.
The pattern instance that is created can be resized and moved like a regular sound, and its level can be adjusted, to allow portions of a repeated pattern to be played with some variations.