Set different volumes for different alarms
I would recommend editing the ringtone files, because you don't even need to leave your Android in order to do it.

Searching the Play Store, I've found 2 apps in question that claim to adjust volume on .ogg and mp3 files:


MP3 Gain - Play Store
MP3/OGG Volume Booster - Play Store


Hope one of these do the trick for ya. I love the Tasker idea (I use Tasker in many hackish ways that would be considered unorthodox haha)

Anyway, hope this helps