Been messing around with a beta Lame 3.99 encoder after finding out about the --allshort switch. I have no idea why it not used in the finalised encoders since with 256kbps CBR with Allshort on Eig.wav goes from having pre echo artifacts to being fully transparent?. Turns out that switch forces MP3 to act like a Subband codec from a thread on HA in 2002.