Você pode fazer isso com xset
( com a ressalva de que a maioria das coisas que xset
pede pode ser ignorada):
The
c
option controls key click. This option can take an optional value, a preceding dash(-
), or an 'on/off
' flag. If no parameter or the 'on
' flag is given, the system defaults will be used. If the dash or 'off
' flag is used, keyclick will be disabled. If a value from 0 to 100 is given, it is used to indicate volume, as a percentage of the maximum. The X server will set the volume to the nearest value that the hardware can support.