Jazzmammal is right of course but if I may present another perspective. As soon as the world becomes more perfect I'll worry about imperfections of Biab/RB. For me, the upside is what I have learned from this forum and the excitement of what lay ahead in the world of prerecorded digital music. The purist might never be impressed with Biab or RB for the reasons Bob states. In fact, I have music friends (or rather associates) that won't even speak to me because of my decision to write (a completely new experience for me) and dare to release songs using this product. Given my instrumentalist limitations, I probably would have never travelled down the incredible songwriting journey without it. When the wonderfully gifted pianist I was working with got angry with me over a difference in musical concept, and told me to do it myself, Biab allowed me to do just that. It does what I say and doesn't talk back. In three months I have learned Biab, RB (albeit by being a pest to the PG Music Technical Team, God Bless em) and Sibelius, have improved my vocal quality and constantly developing the confidence explore and grow. I am a happy camper.
Carolyne