No audio when Avidemux plays video.

[eltodesukane]

I installed Avidemux 2.7.3 on my new Windows10 desktop computer.
When the video plays in Avidemux, there is no audio (the original file has audio).
Loading .mp4 or .mkv has same problem, no audio.
Why this problem? How to fix?

[eumagga0x2a]

"dummy" audio device instead of "win32" selected in the Avidemux preferences?