Hey Paul,

I tried also to get this working in BIAB. I ended up just mixing down to WAV and then dragging it into Audacity. FWIW, Lame is awesome, it sure does make your mp3s sound better. I was advised a long time ago to convert using the maximum quality, as well as always using VBR (Varible Bit Rate)
After experimenting, I know why and my tracks still have great dynamics.

Ed