Operational Transconductance Amplifiers, or OTAs, are not the same as op amps. They are more like voltage controlled current sources, see link below for informative info from a former Moog employee. From my recollection, a typical early example CA3080 was not particularly hifi, but was used for musical projects like envelope controller, auto gain control and filter applications. Probably the latter for a phaser.
http://www.uni-bonn.de/~uzs159/ota3080.html I tried the demo and it sounds nice btw....
mike_mccue
It models "Operational Transconductance Amplifiers" which is a fancy way of saying "Op-Amp"... which is a fancy way of saying "transfer function"... which is a fancy way of saying "equation"... which is a fancy way of saying it does math.
So it sounds good?