Estimated Prophet is played in position 2, Bridge/Middle.
Disclaimer: I make and sell Buffers. I also sometimes Modify, Build and sell preamps and amplifiers. My opinions are not intended to be sales pitches. I am a one man shop and prefer to spend time with my wife and family, i work full time on call and love to spend my spare time doing other things. I only make, modify or build things for those that seek them.
Jerry used those positions more or less frequently. I can't really think of any specific examples, but I know I've heard them (especially the M/B combo) on many recordings.... Dead Set comes to mind, tho I can't be certain without going back and listening... I use them pretty regularly myself; candyman, minglewood, OMSN, also my Qtron quacks best in the 2 position... =)