I previously made a lister hotkey that can play an audio file by pushing the right arrow key, without having to initialize the Dopus audio player.
There was a forum topic about this but I can't find it now.
Just found out that this doesn't work with the checkbox mode. I have to check the file with the mouse before the right arrow key will work on it. Using arrow keys to preview audio clips is a lot better than double clicking with the mouse.