Update README.md

Author: themaxw

README.md

@@ -10,6 +10,14 @@ Put the Main Plugin on the Master Bus of your DAW, set ip and port to the receiv
 
 ![Seamless Plugins Signal Flow](./docs/graphics/seamless-plugin-suite_signal-flow.png)
 
+### control using external OSC
+The Main plugins listen for external OSC-Messages on the port specified in the main plugin. The following data paths are supported:
+
+| OSC-Path | data format | comment |
+| --- | --- | --- |
+| `/source/pos/xyz` | `ifff` source_index, x, y, z | x,y,z should be between -1 and 1, values outside this range will be clipped by the plugins |
+| `/source/send` | `iif` source_index, renderer_index, gain | renderer_index starts from 0, with 0 being ambisonics and 1 being wfs, gain should be between 0 and 1|
+
 ## Development
 
 Clone the repo