Mon Jan 10 17:57:34 EST 2011
1. Decay needs to be exponential
2. Attack, well... The low-pass exponential is a hack anyway as there
is no real physical relation. Attack is either instantaneous, or
it is "blown" or "bowed", i.e. a consequence of human actuation.
So what about sticking to the exponential converter anyway, design for
accurate large range decay time, and find a hack to make attack longer
Maybe here switched resistors could work.