Based on the thousands of times I've added a 15 frame fade to events this summer, I would like to try this script. I changed the import statement correctly for each version of Vegas, but then I get a message about the time code variable that I don't understand.

P.S.

I wish the script was credited to an individual in the comments.

Here's a .cs version modified from one of @jetdv's that I hope he doesn't mind me posting:

/**
 * This script will add a one second Fade In and out to all selected events.
 *
 * Written By: Edward Troxel
 * Copyright 2016 - JETDV Scripts
 * Modified: 08-26-2016
 * Converted to .CS and new Vegas namespace
 *
 * 10-18-2018 - Version to fade in and out by 500ms by Nick Hope
 *
 **/

using System;
using ScriptPortal.Vegas;public class EntryPoint

{
  Vegas myVegas;

  public void FromVegas(Vegas vegas)
  {
    myVegas = vegas;
    foreach (Track track in myVegas.Project.Tracks)
    {
        foreach (TrackEvent trackEvent in track.Events)
        {
            if (trackEvent.Selected)
            {
                trackEvent.FadeIn.Length = new Timecode(500);
                trackEvent.FadeOut.Length = new Timecode(500);
            }
        }
    }
  }
}

@NickHope

Thanks Nick. The thought occurred to me while I was out this evening doing electrical work for free that if one wants to run a Java script, then one ought to have Java loaded on the machine. This machine does not, but one of my other machines does.

Your altered script added a 15 frame fade out.  I added this line to also Fade In.

trackEvent.FadeIn.Length = new Timecode(500);