Seriously, if the backtrack have Soyeon's voice in it, Soyeon's lines was not sang by Eunjung & Hyomin themselves already.We all know it is easier to sing well when guided by a greater singer.
No.it's not that I don't hear Soyeon voice, it's the fact that I love Soyeon's voice so much ,that I straight away can hear that Soyeon's voice is in the performance. I can easily differentiate her voice from other members.
Even the so-call MR removed, still have some amount of Soyeon's voice in it.