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I checked IC2’s socket and all pins are completely through the holes and appear cleanly soldered. The IC is properly seated. I replaced it with another brand chip and I get the same readings. I’ll try resoldering pin 14 of the socket tomorrow in case it’s a bad joint.

Following the voltage path from the schematic, I get a voltage drop from 8.95 (what the power supply is currently outputting to the board) to 8.25 across D4, then another drop to 7.08 after R28 (value correct) which is the input voltage the IC is seeing. I’m not familiar with how output at pin 14 is determined so I’m not sure what other components would affect the output.

The stomp switch board is a 3dpt buffer board. I’ve confirmed that the IO from the stomp switch board to the main board is correct.