-9- I like the boot tune, but it's just a bit too loud. How do I tone it down a bit?

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Subject:    -9- I like the boot tune, but it's just a bit too loud. How
                do I tone it down a bit?
Date: 20 Aug 1994 00:00:01 EST

  The boot tune volume is controlled by the 'volume' variable used by
  the system PROM. The value for 'volume' can be set in the range
  [0-255], where lower numbers represent a lower boot tune volume.  A
  'volume' value of 0 disables the boot tune, viz. the tune is not
  played at all.  The value of 'volume' can be set in the PROM monitor
  or using the nvram(1M) command.