1. Make a stereo audio file with very obvious differences between the Left and Right channel
  2. Assign it to an AudioSource component
  3. Enter play mode (with ClientSim)
  4. You hear both channels
  5. Add a VRCSpatialAudioSource component to the same gameobject
  6. Enter play mode
  7. You hear only the left channel
  8. Do a Build & Test
  9. In the actual client, you hear both channels