I am confused as to how/where hardware pins are assigned to controls

Troubleshooting and Support
1

Today I uploaded a reverb bin to my daisy seed. I opened flash.daisy.audio in Chrome, and uploaded the sploodge file in C:\Users\abelo\~\Desktop\DaisyExamples\seed\loewenzahnhonig-firmware\bin

I am trying to learn from this code how to alter a preset parameter (delay line or anything). The analog part was easy.
I tried using one of the unused analog pins to create a parameter:

    1. B10k pot, one wire to 3.3V, the other to GND, and the center to pin 28-ADC1_INP4

      1. Pin 28 is defined in daisy.seed.h as Pin(PORTA, 2), and in daisy as GPIO22

      2. For reference, the first knob is Pin 22, defined as PIN(PORTA, 5), and in Daisy as GPIO15, and I THINK in the reverb cpp as adcConfig[0].InitSingle(hw.GetPin(15));

In VSCode, I am looking at the sploodge-reverb.cpp, the reverbsc.cpp, the daisysp.h, and daisy_seed.h and trying to identify where the first knob (PORTA)’s function is defined. But I can’t see that. Can anyone point me to where to look for that?

Edit: In case this is “you need to learn cc+ first” if there is a good resource for learning that in relation to daisy, please let me know.