Mix lullaby sounds

From Anonymous on 2015/05/29 06:24:27 +0000

I would love to be able to combine 2 or 3 lullabies. It would make the short clips less noticeable as well as add depth for relaxation.

Copied from original feature request: http://urbandroid.uservoice.com/forums/264867-sleep-as-android/suggestions/8154654-mix-lullaby-sounds