>>/1227/
Great, thanks for letting me know. For sound on your video, it may be that you have mpv now but because you once did not, hydrus reverted you back to the old renderer in the options.
Please hit help->about and see if you have mpv (it will give you a popup error if you don't). If you do, then hit up file->options->media, and for video and animation, change the 'media show action', if it is set to 'show with native hydrus viewer' to 'show using mpv'.
If you don't have mpv in help->about, let me know.