”Make Believe” and “Velvet” have never been recorded by The Birthday Massacre although they are the band's songs. Played live as Imagica, but not recorded. Two audio clips often found on the internet claim to be those two songs but are actually short clips of other barely begun tracks. - From the FAQs on the official forum. So, unless someone has video of it... :(
That "Velvet" song you are talking about are probably the "imagica samples" that were spread around the internet. Can't serve my memory correct, but i think they were just demo songs around Imagica days, not demos of neither Velvet or Make Believe. Unless there's live songs of those two around somewhere.