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Plugin for passing OSC messages between applications

August 18, 2026

Reaper project with four approaches to decoding and Atmos re-encoding.

Oscar at play: Passing OSC messages from Reaper to Max.

Some years ago, a VST plugin called ToscA, developed by Thibaut Carpentier at IRCAM, enabled OSC messages to be passed between, for example, Reaper and Max. I used it extensively when developing the sound design for the Whale Hall at the National Historic Museum in Bergen, automating the positioning of multiple audio objects in Reaper while performing the spatialisation using a custom triangulation approach in Max. However, the ToscA plugin was no longer maintained and eventually stopped working.

Yesterday, I was pleased to discover that it has been revived. It is now called Oscar and works just as before. I wouldn’t mind if they had updated the GUI somewhat and made it scalable, but the most important thing is that it is really nice to see this feature alive again.