Once bug 1368827 lands you should also be able to set the volume for the 'alarm' role via the indicator (and with the vol up/down buttons), but only when the alarm audio stream is active (playing).
Once bug 1368827 lands you should also be able to set the volume for the 'alarm' role via the indicator (and with the vol up/down buttons), but only when the alarm audio stream is active (playing).