lock screen audio control doesnt work

the app description says that you can control the sounds from the lock screen but I cant. also theres no timer on this app so I guess it will just goes on and on if we both fall asleep. my 7 week daughter fell asleep to the sound of the womb but the sound annoys my husband and idk when to turn it off so that she doesnt wake and so he could sleep. note to developer, add a timer please!!!

A GOOD(wo)man about Womb Sounds - Baby Sound Machine