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command

% xset b off             # bell off
% xset b on              # bell on
% xset b                 # default
% xset b 50              # volume:50
% xset b 100 10000       # volume:100, frequency:10KHz
% xset b 100 1000 100    # volume:100, frequency:1KHz, length:0.1sec

note

Usage: xset b [volume] [frequency] [length]

volume: 0 - 100
frequency: 0 - 32767
length: 0 - 32767

cf.
% man xset