print 'Usage gen_sound <freq> [<length>] [<volume>]'
print ' where <freq> is the frequency in Hz (int)'
print ' [<length>] is the time in seconds (float) - default 0.25'
print 'Usage gen_sound <freq> [<length>] [<volume>]'
print ' where <freq> is the frequency in Hz (int)'
print ' [<length>] is the time in seconds (float) - default 0.25'