Every virtual Source in a Room has its own set of variable parameters which define its simulated positional information, psycho acoustic properties, virtual acoustic properties and other options.
To edit the variables of a source in the Source Parameter editor, you must first be inside a Room. Select the source you want to edit from the list on the left side panel of the Room editor by left clicking on its Index number. Alternatively, grab its ‘emitter’ object in the 3D Room visualisation ( or just one of them, if the source is a multichannel group). When you select a source, the Source Parameter editor will pop up as a set of categorised groups with which you can alter the properties of the Virtual Source in the Room.
Additionally a right click on a Source Index number will bring up some further options, especially useful is the Colour option, which allows you to set an identification colour to a Source or Group.