Hi: I just purchased a Droid 4 yesterday. I purchased a custom song ring tone for when my phone rings. However, when I receive a voicemail, the "notification" of the voicemail is the same long, ring tone. I want the voicemail notification to simply be a beep or a vibrate, but the phone doesn't seem to allow for it to be different than the ring tone. Can someone offer assistance or a specific application (with directions) to help me? Thanks very much.