Here’s how to get this working - SOVOL SVO8 Beep command M300 - #3 by SV08_user
Note that you need to make the beeper pwm enabled
Also note that depending on the klipper version, the definition of the PWM pin may need changing to a ‘pwm_cycle_time’, here’s how mine now looks
[pwm_cycle_time beeper]
pin: EXP1_1
value: 0
shutdown_value: 0
cycle_time: 0.0005