Phaser LFO idea

[KA4HJH]

>Forgive me if this has been done but I've always wondered if it would be
>possible to build a phaser with an LFO that, rather than the usual GAIN and
>DEPTH controls or sometimes just DEPTH, had 2 pots marked TOP OF SWEEP and
>BOTTOM OF SWEEP. The advantage being that instruments in different registers
>need a different sweep to get a nice even swirl and avoid the part where
>nothing much happens.
>Put in another way can you make an LFO where you specify the exact height of
>output swing, top and bottom using analogue stuff? I'm sure it can be done
>but can't picture it. Another thing that springs to mind (that could be
>used) is the idea of a slider pot with 2 wipers (homemade?) to avoid
>problems of crossing over ranges.

Another interesting idea.

This is a good time to repeat my request for a Constant Slew Rate LFO. The
Speed and Depth controls counteract so that a constant slew rate is
maintained. Would be great for phasors, flangers, and anything that does
pitch-bending. I'm sure if we all had one it would be like "why didn't
somebody do this before?!" Everytime I get something interesting happening
with one of these processors I get annoyed having to constantly switch
between the knobs to keep the slew rate from getting too fast or too slow.

I can see the block diagram in my head but have gotten anywhere near a
bench in quite a while...
-- 
Terry Bowman, KA4HJH
"The Mac Doctor"