15 May
2004
15 May
'04
7:57 a.m.
Mike Rawes wrote:
You're right - there's an asymptote at x=0 -
there's no correct way of
dealing with it. What I've done in the past is do linear conversion near
0:
to linear:
value > e : log(value)
< -e : -log(-value)
: value / e
to logarithmic
value > 1 : exp(value)
< -1 : -exp(-value)
: value * e
However, it is also perfectly valid to simply clip the lower bound. What
isn't right is for a host to *assume* that the lower bound of a
LOGARITHMIC
port is always > 0. I myself want to be able to specify a logarithmic
frequency port with range + / - 24000 for my oscillator plugins, without
having a host break by doing log(-440) or something.
But how can the host know how close to zero the exp should become
linear? What do you do with a LOGARITHMIC parameter with the range -1.0
to 1.0? Something is missing here to make the LOGARITHMIC hint
unambiguous. But maybe that's not the goal of LADSPA. :(
Marcus