[ddots-l] Can't return Sonar volume to null

Guys,
        I can't return my volume setting in a track to null.  The
tutorial in Sonar 4 says I can do that by typing minus 1.  I assume that
means dash 1 where the dash is located to the right of the zero on the
number row.  However, when I type a dash, no character appears in my
column display.  So, dash 1 gives a value of 1 which yields no sound.
How do I return my column values to null when I want to?
Kevin

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