Experimenter board problem -VCA hitting the rails

[animalman]

Would be super grateful if someone could help me out here.
I've always noticed that the sounds coming out of the VCA always sound much louder than what I put in. So after recently getting an oscilloscope I've started to look at the waves and voltages. And putting the VCA output thru the scope I could see that it puts out a signal that's 21V peak to peak. Yikes!
Is there anything in this schematic that suggests such an amplification of the signal?

http://www.musicfromouterspace.com/forums.html?MAINTAB=SYNTHDIY&PROJARG=EXPERIMENTERBOARD/page4.html&VPW=1270&VPH=569

As I'd rather change some components on the pcb than putting a voltage divider to tame the hot distorted signal.

the hot VCA p-p values seem to be the same in this guys build blog. So it makes me think it's not unique to my build.
https://solderspot.wordpress.com/2014/12/11/synth-project-pre-testing-the-circuits/

[animalman]

digging a bit deeper and checking the data cheat for LM13700, it looks like R83 on Rays schematic is seting the output voltage range. So will try put in a trimmer and see if I get different results.