When loading a template for Spat or saved when working with another DAW project, the send/return may be duplicated.
Here is how to merge the old with the new ones.
Then, as soon as fixed, don't forget to save a new copy of Spat project (one spat project for each DAW project seems to be a good practice)
- convert to hardware IO
Select all the send or return in red (the ones saved in the spat project, connected to the room), then clic on 'convert to hardware IO' button, on the right. It will result in hardware input instead of send/return local audio path instances.
- merge one hardware IO with the corresponding active send/return instance
Select one hardware input (that has just been converted to hardware IO) and the corresponding local audio path instance, then clic on 'convert hardware to send/return'.
It will merge those two items in a single one, connected to the DAW and your Room(s)