To be honest, to me, I feel that when Ayu sings live, it's almost exactly the same as her voice on the CDs and original tracks.
However some other artists (and mainly american artists) when I see/hear them sing live it's nowhere near their voices on their cds, so credits to Ayu.
I don't think Ayu lip syncs but I wouldn't dislike her if she did. I've seen performances where they play the track behind but she wouldn't lip sync to it, she'd actually sing to it and you can even hear her actual voice as well =D
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