PiCade Button Mapping Help

Hey guys, for months i struggled to get my Picade (Original) to work with any emulator, the buttons work flawlessly in the ES menu, but when i launched any rom the binds would be all out of whack, now i seemed to have found a solution by creating a custom map using button ID’s, but i can only find the numerical ID for A, B, X, Y, Start, Select/Coin, L, and R buttons. I was hoping someone can shed light on the Numerical ID of the Volume buttons as id like to remap them to exit the emulation as i cannot currently do so with the binds i have. Here is my binds currently:

input_device = “Arduino LLC Arduino Leonardo”
input_driver = “udev”
input_l_btn = “8”
input_load_state_btn = “5”
input_start_btn = “13”
input_exit_emulator_btn = “7”
input_down_axis = “+1”
input_r_btn = “11”
input_save_state_btn = “2”
input_right_axis = “+0”
input_state_slot_increase_axis = “+0”
input_select_btn = “12”
input_left_axis = “-0”
input_state_slot_decrease_axis = “-0”
input_l2_btn = “9”
input_up_axis = “-1”
input_a_btn = “10”
input_b_btn = “9”
input_reset_btn = “3”
input_enable_hotkey_btn = “8”
input_r2_btn = “11”
input_x_btn = “7”
input_menu_toggle_btn = “4”
input_y_btn = “6”