According to Osho, yes—if a humming arises on its own in deep silence, simply listen and enjoy it without anxiety. It is the song of existence, akin to OM, and a sign you’ve reached serenity. Do not repeat or manufacture it; that becomes mind-made noise. Remain utterly passive, relaxed, trusting.
If a gentle sound appears when you’re truly quiet, just listen and enjoy—it’s real; don’t try to make it.