Cdex default variable bitrate? Have I made mistake?!

@miikerman wrote:
Even better:  with VBR, the amount of space given to the music varies throughout the music constantly, so that, for example, there is a moment of silence ins a tune, less space is given to that portion of the music.  Presumably, this can work a great space savings and, on the flip side, enhance the sound in complex passages.

That’s right. I’ve been using LAME and with it you can see how the encoding process automatically uses the optimal bitrate (from 32 up to 320 kbps) for each frame (1/75 sec, IIRC).