mine was mute too for a while because I was worried about battery life but since I had my kindle replaced and had never used this feature on my previous one... I broke it and had this big regret thing going on... I thought this time why not...
Voices would be distracting. so sounds only. I find it helps drown out all the other noises going on in my house. Quiet does not happen in my house until after midnight and I am asleep then :-)
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