tying the notification and ringer volume together was actually that was one of the biggest gripes that came as a result of ICS. What about folks who wanted their phone to ring any time but shut off their notifications off at night. Restoring the two as separate entities, but having access to them on the same screen was the most brilliant thing that they did. So when you are at Settings > Sound > Volumes, and you slide one bar, slide the next. Elsewise you can use the physical volume rocker to put your phone into vibrate or silent mode and everything will be quiet.
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No you wont.