You need to rename Unlock.ogg to Unlock.ogg.bak.Exactly what I wanted to do thanks! The only problem I am having is the unlock sound it doesn't change. Are you sure it's the Particle_unlock_silence.ogg that needs to be changed?
Edit: So I kinda fixed it. I had a pattern lock on and when I switched it to swipe it worked but the same time it didn't. It plays the default sound and then right after it plays my sound. Both while unlocking. Any ideas?