Patterns are blocks of music consisting of 64 lines.  Each line is a slot for a note.

Saving Patterns:
   You can save patterns from the Pattern menu.  Patterns are saved in a unique MacMod Pro format and are not recognizable by other programs. 

Loading Patterns:
   When you load a pattern, it is added after the last pattern of the selected song.  If it uses less voices than the selected song has available, the excess voices are left blank.  If the pattern has more voices than the selected song, the excess voices will be clipped.