I knew before I'd ordered there were a few things wrong, this board is just for testing, I will build 2 or 3 of these and then order another revision next week. I have a surplus of pots for sure, I will use the pots to decide what input and output of the 555 would be best. I don't know yet how to change amplification of the tca opamp so I have that at unity gain and i'm using the pots to attenuate the signal. Would it be better to replace those with a voltage divider or regulator?