The synth on baba o riley was in fact a lowery organ. not a vcs3.
there is more information here :
http://www.thewho.net/whotabs/equip-baba.htm unfortunately richard rowleys site is down, this used to have mp3 examples of the equipment, and a midi file for the track, which i used to create a very faithful version (sampling the individual notes from the original track and putting them on my akai s3000)
he also had a section about the who are you synth, which was infact a heavily distorted guitar, through a vcs3!