I found the same thing - BIAB's timestretch algorithm (unfortunately) doesn't seem to be that much better than Audacity or any low-end algorithm. That's problematic if you're trying to deal with tempos slower than what an instrument was recorded at.

To be fair to PG Music, they only say :
Quote:

And you're not limited to 165 or 190, all tempos in between are also covered with the superior stretching features in Band-in-a-Box.


So they don't advertise that you can get any slower tempos. I suspect they made a trade-off to allow users to rapidly change song tempos without having to rebuild all the RealTracks.

But it is problematic if you want to use a RealTrack that's just a bit lower than the recorded tempo, which is... always.

I posted a short instrumental done the other day with the Bossa Nova flute. The song tempo was 120 BPM, and the flute's speed was 140 BPM. I exported it at 140 BPM and slowed it down with the elastique algorithm in Reaper, and it essentially artifact-free. (I did some extreme stretching to some of the samples while editing phrases).

Perhaps PG Music might consider adding a "high quality" timestretch option for those of us who insist on abusing the software past the stated limits?

-- David Cuny
My virtual singer development blog

Vocal control, you say. Never heard of it. Is that some kind of ProTools thing?