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OpenMusic DocumentationOM 6.6 User Manual > Visual Programming II > Control Structures > Sequential Operators
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Sequential Operators

Sequential operators control the occurrences of operations in program. They can apply to the iteration of an operation, or to the succession of several operations at a single evaluation.

Sequential operators can be accessed via the OM Kernel / Control menu.

Repeat-n : Iteration

Repeat-n evaluates something a number of times and collects the results in a list, so that the manual evaluation doesn't have to be repeated.


Repeat-n has two default inputs :

  • "self" takes any type of data, a function, or a lambda function.

  • "num" takes a number.

The data assigned to "self" is repeated n times. The result is returned as a list by the output.


Here, repeat-n is applied to om-random to produce a random notes sequence.

Repeat-n evaluates om-random 15 times : each time, a random value is returned. The resulting list is returned to the pitches input of the factory box.

Advanced Use of Iteration : OMLoop

More complex or specific iterative processes can be designed and controlled via the OMLoop module editor.

The Omloop Module

Sequence : Executing Several Tasks


The sequence box executes a sequence of distinct operations.

  • It has one default input and output. The "patch" input takes any kind of box.

  • It can be added as many "oppatch" additional inputs – "patch" input q– as necessary :

  • Multiple outputs can return the result of corresponding upstream operations to other boxes.


A chord-seq is generated while other tasks are executed.

When the chord-seq is evaluated, sequence performs three tasks :

  1. print "avant",

  2. generate and print a random list of numbers,

  3. print "après".

Then, the value of its second output is returned to the "pitch" input of the chord-seq.

Note that without print, the Listener wouldn't display the values the outputs of sequence. These values can be returned with an individual evaluation of each output.

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