Thanks for your response mywmyw!
Pretty sure mine is operating as designed then. Yeah my 2134s are fairly old but if I recall they came from mouser digikey or small bear from a bulk parts purchase I did probably 5 years ago (or more). Just played with it a bit more this afternoon & the guitar volume roll off seemed to work a bit better (I may have had the gain excessively high previously when testing and messing with parameters). All the controls are fairly interactive with each other. It just seemed much treblier in the demos at different hi cut positions than what I was experiencing, and the gain levels seemed different @ different levels which is why I was questioning the pot tapers. Doesn’t really make any difference in the overall flexibility. I think I actually prefer the less bright sound, but wanted to double check others experience to see if something might be wrong with my build. I might eventually change the gain pot to an audio taper for better control for me, but overall, I dig it.
Thanks again!