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/usr/share/psychtoolbox-3/PsychObsolete/SysBeep.m is in psychtoolbox-3-common 3.0.14.20170103+git6-g605ff5c.dfsg1-1build1.

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function SysBeep(n,delay)
% SysBeep([n],[delay])
% 
% SysBeep is OBSOLETE. Use Snd instead.
% 
% Play n system beeps (default 1), separated by "delay" ticks
% (default 0) between beeps. Each tick is 1/60.15 second. The
% beeps are still distinguishable even when "delay" is zero.
 
% 5/7/96	dgp Corrected definition of tick.
% 3/23/97	dgp Arguments are now optional.