Hi All, If people use Airplay to send audio to different output devices there has been a change in how this works in Ios 11. I've found that the following works but it isn't as easy as previously. I also don't know how this would work if you don't have 3d touch. However if you do then if you open Control center as per the normal way. Then flick to you hear "media controls music" press and hold this and it opens a new menu. Flick around and you hear playback destination. Double tap this and you can choose your output. HTH as it took me ages to work out how to do this.