[sdiy] panning/crossfading curves

[sbernardi]

Yes, that's true - it will appear softer in the middle. I'm not familiar
with the Serge circuit, but there was a circuit in Electronotes called a
GLAP (Generalized Linear Amplitude Processor) that could do both crossfades
and panning, and had  correction for "equal power" curves. I made a PCB from
it but I haven't wired it up yet. I'll report on it when I get to it.

mark verbos wrote:

> Am I right in assuming that a perfectly linear crossfade with sound
> quite in the middle? A sort of dead band...
>
> When Buchla did a voltage controlled pan he used a dual Vactrol on both
> sides with a resistor to ground on the center tap. A little math and
> graphing on a piece of scrap paper tells me that the resistamce curve is
> antilog. So this will make the center position appear to be just as loud
> as either side?
>
> He did the manual pans with a single pot, so this could not have been a
> really big issue. Is that what the Serge Equal Power stuff is all about?
>
> rock on.
>
> mark