Text message sent alert

[Carloscda39]

I want to keep the bubble that pops up saying message sent but I don't want that alert sound. I went threw settings-sounds & notifications and unchecked play sound for messaging. But the sound still plays?
Any reg hack for this? I've done the hack to eliminate the notification but that's just it. I want to keep the notification but I don't want the sound.

Thanks in advanced!