[CM] negative number in cond

[bil at ccrma.Stanford.EDU]

(I accidentally deleted the original, and there's
no undelete in this mailer), but I think your
problem is that in both these cases, you're not
getting a range:

     ((and (>= -6 theslope) (<= theslope -10))
     ((and (>= 6 theslope) (<= theslope 10))

You get (<= theslope -10) in the first case -- I think
you accidentally reversed the order of the arguments.
It might be more clear to use (<= 6 theslope 10) etc.