I tried using that double attack mod they had for ACT but it would never trigger a sound.
I just use the Regex portion they have for Triggers/Sounds and it's been working just fine.
I did however need to get a WAV file to use, that system beep is rather annoying (and loud if you have WAV turned to max on sound).
So, if you want to know how to do the regex for sound triggers I have something to help.
I dont know what the regex would be for a miss but I'll fiddle with it later and see if I can come up with something, that way you'll know when you miss too.
If anyone wants the WAV file I use for this let me know and I'll try to upload it somewhere for DL. It's a pretty good one, a slight ding sound that is soft enough not to annoy, even with melee auto attack
