eml synthesizers

I forgot to mention that the op amp that the glide knob fixed leads connect to is an LM748, not the LM741 shown in the schematic. There is another LM 748 just above it as well. Are these the 748's of the Sample and Hold circuit? Is the wire maybe connected to the wrong place on the circuit board? I will look into this further. I am tired...

Thanks again,
Steve DeJesus