SHRIEK 1.6 -- lets you change pitch and duration of the beep.
      SHRIEK duration frequency
e.g.  SHRIEK 250 554
      where duration is measured in milliseconds and frequency in Hertz.
Shriek changes the pitch or duration of the standard system
beep.  When you accelerate your XT or AT clone, sometimes the
ROM BIOS is not prepared for this eventuality.  Beep tones may
start coming out as piercing high-pitched shrieks.  Beep tones
may be too short in duration.  Shriek is a 96-byte TSR that
repairs this defect in your BIOS.  You can configure Shriek for
whatever pitch and duration you like best.  MASM/OPTAsm source
included.  Copyrighted, but may be freely distributed and used
for any purpose except military.  Version 1.6 just displays the
new address and phone number.