Should I see anything different? on the serial you can see it converts the signal the max value of 16383.
If you run a software like MIDI monitor, you'll see the potentiometer doesn't react as it should. if you rotate it to the right or the left it will go to max value. Specially when using V_POT_1 I'm guessing it expects to see a + or - from an encoder.
I'm sorry, I am trying to understand if I should see something different.