@jfg said:

Am I correct in assuming that Isadora receives sound from an NDI source

 The NDI watcher actor only captures the video feed supplied by the NDI feed. A future version of the actor may provide the audio feed as well. We are working on extending Isadora to offer broader audio support. You can expect to see the Multi-channel audio routing currently available in the Sound Player actor appear in more actors as we move towards Isadora-wide audio support.