It's a pretty straight forward idea. And I think it should be relative simple to add to the existing functionality.
Plenty of times I import sounds and they are very loud. I end up changing the volume to -5, then I have to run it and listen to the level. Nope still too loud, stop the preview, go back into the sheet and make it -8, then test again. Sometimes the place where the sound is triggered is a pain to get to etc...
It would be great if you could hear the attenuation when you tap the Play button (in the Action dialog box). Have the play button click take the value from the 'volume' field.
If you like the idea, please vote here: