[PD] problem: expr~ divide by zero detected

[federico]

main problem: i want to control an osc~ by a logaritmic curve.
i use a vline~ to track the linear line, and an expr~ to wrap into a 
log(..) curve.

the problem is that expr~ complains about a division by zero.
i inserted a number to check if is it true... and in the fact the 
"dividendo" is not zero.

how can i solve this problem? (the problem of: having a 
linear/logarithmic/exponential vline~ object)

many thanks

-- 
ciao!
Federico