OSC targets parameters with a left-to-right hierarchical address path plus a value

Open Sound Control (OSC) is a UDP protocol that addresses parameters with path strings like filesystem paths, getting more specific left to right, followed by the value to set. In VPT the path starts with the broad domain (a layer or the sources), then the index, then the parameter: /1layer/fade 0.5 sets layer 1’s fade; deeper nesting like /2layer/brcosa/brightness 1.2 reaches a sub-parameter; sources follow /sources/2video/rate 2. VPT receives OSC on port 6666 and sends on 6667. The router internally builds OSC messages the same way, so the addressing you learn for OSC and the router is one shared scheme — and any OSC-capable tool (Processing, PD, Max, a phone app, Vezér, ossia-score) can drive VPT programmatically.

Examples

From a Processing sketch send /1layer/fade 0.5 to localhost:6666 to fade layer 1 to 50%; send /sources/1video/random to jump to a random clip in source 1.

Assessment

Write the OSC message to set layer 3’s fade to 0.5, and the message to set source 2’s rate to 2. What port does VPT listen on?