If you are playing from the scheduler, the audio device you want to use for output must be the default audio device on the computer. Some of the computers auto switch from speaker to headphones when the phones are plugged in. You need to do that before starting Vixen, so the headphone output is already set.
The audio library in Vixen is older and it does not handle well all the new sound devices that have a lot of software magic under the covers to make them work.
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