I would like to better understand why you're dropping the role completely instead of moving to the NotificationRole? As it stands right now, it'll use the old MultimediaRole at the media-hub and PulseAudio layer. So if you have music playing in music-app and then you go into the clock-app to preview the alarm sound, it should actually pause the background music instead of the duck-in effect. If that's what you desire then this is fine.
I would like to better understand why you're dropping the role completely instead of moving to the NotificationRole? As it stands right now, it'll use the old MultimediaRole at the media-hub and PulseAudio layer. So if you have music playing in music-app and then you go into the clock-app to preview the alarm sound, it should actually pause the background music instead of the duck-in effect. If that's what you desire then this is fine.