input

Hi, I am new to linux and i recently installed parrot home. When i record my screen, the sound from the microphone is some scratchy, crackling sound. The output audio works though. And i have changed the alsa config, and installed pavucontrol. This is the output when i run alsamixer:

The input-event-codes.h contains multiple entries for FORWARD key, 1.#define KEY_FORWARD 159 /* AC Forward */ 2. #define KEY_FASTFORWARD 208 3. #define BTN_FORWARD 0x115 Does these codes are intended for different purpose? If yes, What are those?