Bell event: window 0x600001, requestor 0x600001, time 1234567 This confirms the application sent a bell request to the X server. Disable the bell entirely:
xset b off Enable with volume (0–100) and duration (ms): xev bellringer fre
xset r rate 500 30 # Delay 500ms, repeat every 30ms View current settings: Bell event: window 0x600001