Discussion about the Korg PolySix synthesizer

Yeah, so, I started getting signs I needed to dive back into the 367 
and do some follow-up work.  I replaced IC30 with another 74LS08 and 
did a few things around R17.  

Turn it on and I'm getting distortion on the output. What?  On all 
banks, all patches. No switch or knob eliminates or changes the 
distortion. What could I have possibly done to cause that working in 
the battery area?

Anyone have any ideas before I pull out KLM367 again?

Thank you.