FOMUS can "splice" together the outputs of two or more runs of the FOMUS command. This allows sections or parts ("chunks") to be produced separately and put together later into a complete score. This allows the user to use different arguments and settings values with different sections of the score.

This feature is "experimental" at the moment (it will be fully functional soon). FOMUS outputs a chunk object automatically on each successful run of the FOMUS command. If no outputs are specified, then :CHUNK or :NONE must be given as a backend. A chunk is actually all of the measures in the processed output that contain anything other than a measure rest (ie. all of the measures that contain notation). So it can include either a part, several parts in a range of measures, every other measure over a certain range, etc.. Chunks can only be merged together if there are no notational overlaps. (At the moment, they can't be "relocated" or given an offset--this will be added soon.) FOMUS considers parts with matching PARTID values to be the same and will match them accordingly. New (or non-matching) parts may also be merged tegether into one score--FOMUS matches, adds, and reorders all of them automatically.

There are several ways to tell FOMUS to merge chunks. Some examples are given here in both Lisp and command-line syntax:

(fomus (list (fomus ...fomus_args_chunk1...) (fomus ...fomus_args_chunk2...)) :filename "path_to/myoutputfile" :output :musicxml-finale)
	

(fomus (list "path_to/myfomuschunk1.fms" (fomus ...fomus_args_chunk2...) "path_to/myfomuschunk3.fms") :filename "path_to/myoutputfile" :output :cmn)
	

fomus -lw path_to/myfomuschunk1.fms path_to/myfomuschunk2.fms path_to/myfomuschunk3.fms
	

In each case, two or three chunks are either created from another FOMUS command or read in from an input file. The chunks are then combined together and output as one file.