Try this in mixer_paths....
<path name="speaker-regulation">
<ctl name="RX7 Digital Volume" value="75" />
Origins value are "75", it can rises up to make alarm n notification sound higher.. Like 85+
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Make sure in <path name="speaker">
<ctl name="RX1 Digital Volume" value="xx" />
<ctl name="RX7 Digital Volume" value="xx" />
Must be changed with high values (me use "90"), then follow with same values in "speaker-regulation" too..to rises alarm n notify sound..
NOTE: so changed in "speaker-regulation" only.. it will doesn't work
I hope any understood with my speak