Can I have different volumes settings for notifications and ringtones with Nexus 4/Android 4.2?

My old Gingerbread phone would let me have a low volume for notifications while having a high volume for ringtones (very useful at night). My new Nexus 4 seems to have these volume settings tied together. Is there any way to separate them? I'm running Android 4.2.1 stock. Have looked at a Nexus 7 running 4.1.1 and it has separate volume streams so this looks like a phone specific bug/feature. **Update** Tried various apps but couldn't fine one which separated the Ring and notification audio streams. In the end I downloaded the Cyanogenmod notification sounds , selected the ones I liked and processed them to -10db and -15db versions. Then copied them to the 'Notifications' folder on the phone. (The phone looks at the title tag in the mp3 file rather than the file name so needed to change that as well.) I now have the ringtone as normal but a quieter version of the notification sound that doesn't wake me at night or sound ridiculously loud in meetings.