The theory is that the HDMI projectors are acting as hidden audio devices, and registering at some root level with MacOS as an audio device in an index of some sort, even though they do not show up as audio devices in the Sound Preferences "Sound Output" window or Millumin audio routing windows. However they do absolutely have audio outputs themselves, and are connected directly HDMI via the USB-C/Thunderbolt ports which do have audio capabilities. I do not use the projectors as any sort of sound device, and they do not appear as such at any surface level within audio devices management apps. This is the only variable that was changing between testing and show conditions. There was one variable that I did not take into account, and that was that the projectors had been powered on, and then subsequently shut down prior to the show event when I needed the cue to play correctly. This column had two video files, one data track timeline, and 14 audio stems (not timelines).No routing, outputs or devices we related to the Millumin show file. I had changed the default audio output in the System Preferences for another completely separate application.The ONLY thing that was different from the above was: An hour earlier in pre-show visual/sound check everything worked. Since I last posted I did have another instance where all audio digital outputs refused to output, and a restart of Millumin fixed it. 2020 Mac Pro (cheese grader) with 24 core intel, 48gb Ram, Afterburner and biggest GPU available.This is a digital output via USB to a digital sound device/mixer.The data successfully fired, the audio output did not send out, despite the playhead playing. This instance was audio and an OSC data track in a timeline only.Other applications do not suffer any routing issues, which go to the same digital audio device.Meant to post this in response a while back.
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