I didn't expect Rin's voice to be so high... o.o I wasn't ready for that XD (If this isn't her voice, I'm sorry. I don't listen to her, So I wouldn't know)
it is her voice but evey vocaloid have a bigger voicebank miku sounds normally also higher similar to rin but rin can also get a deeper voice (fun fact rin is 14 and miku 16 luka 17 so the voice difference should be easier to understand) ^^