qmk_firmware_custom/keyboards/planck/keymaps/pete/rules.mk

# Build Options
#   change to "no" to disable the options, or define them in the Makefile in 
#   the appropriate keymap folder that will get included automatically
#
AUDIO_ENABLE = no
NKRO_ENABLE = yes

# Do not enable SLEEP_LED_ENABLE. it uses the same timer as BACKLIGHT_ENABLE
SLEEP_LED_ENABLE = no    # Breathing sleep LED during USB suspend