"I sometimes wake up before the alarm goes off." When we say the alarm goes off, we mean that the alarm starts to make a sound. Your alarm, "alarm," is a machine that makes noise at a certain time; usually it has a clock. Well, "I sometimes wake up before my alarm" makes noise--my alarm goes off. "I like to keep the alarm at a low volume," meaning not very loud, "at a low volume, with some classical music, nothing too jarring." When we say a sound is jarring, "jarring," we mean that it is loud and it causes you to jump or to be surprised. It's something that is not very nice--not very pleasant. A jarring noise would be one that bothers you, perhaps because it is very loud or it is not a very nice sound.
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