In the 7/12/76 soundcheck pics (GDG, p.176) , this keyboard is seen sitting atop Keith's Rhodes:
ARP(by Solina) String-Ensemble into a Mutron III on hi-pass setting is my guess.
Anyone agree or disagree that this is the keyboard sound on the debut of Estimated Prophet, 2/26/77? http://www.archive.org/details/gd1977-02-26.sbd.cantor.deibert.83283.flac16
On what other songs (specify dates if possible) was the String-Ensemble was used?