OM# Documentation

OSC Messages and Bundles

An OSC message consists of an OSC “Address Pattern” followed by an by zero or more OSC “Arguments”.

What follows is a simplified description of OSC features and specification, corresponding to the minimum required to work with OSC in OM#. For a more detailed description, see

OSC address patterns

The address pattern is a simple string following the syntax of URLs, begining with “/”, usually describing a given parameter.
For intance: "/synth/parameters/frequency".

OSC arguments

OSC arguments can be integers, float numbers, strings. Some OSC implementations support additional types.

→ The function osc-msg is a simple utility to format OSC messages in OM#; but the messages can also be created and processed as plain Lisp lists: ("/synth/parameters/frequency" 440.0)


The OSC-BUNDLE object represents a set of OSC messages (optionally assigned to a give date). This structure reflects the notion of bundle in OSC specifications, and is encoded as an OSC bundle with the corresponding “time-tag” when sent over the network.

Manipulating and processing OSC bundles

OSC-BUNDLE can be processed through OM# visual programs thanks to a number of utilities (see osc-get, osc-set, osc-delete, …) or directly by maniuplating the list of OSC messages as a list of lists – each message is a list (address value(s)).

A simple editor (accessible by doublick on the OSC-BUNDLE box) allows editing the contents of the message list directly as text.


OSC-BUNDLE is a special type (sub-class) of DATA-FRAME. The date attribute (milliseconds) can be set to construct temporal sequences of OSC messages and embedded in containers such as DATA-TRACK.

OSC-BUNDLE has some specific properties set with the DATA-TRACK editor. The bundle display can be controlled with messages such as "/size", "/y", "/color".

When played in such time-sequences, the action of an OSC-BUNDLE is a call to send-osc, which sends the contents of the OSC bundle out through the network.