Variable ramp generator

[tomg]

> My idea was to generate a stable saw or triangle and shape it
> using a switched gain circuit. I must say I tried to design such 
> a circuit, but either I am too narrow minded or blind - I just
> cannot come up with anything. I hope somebody invented this before
> and would not mind to share. 
> 
> mb

I have about 15mins to play on the list...I am very busy these days guys.

I'm sorry I didn't pay enough attention to this when it first came up. Boy,
am I off base...but I can fix that.

It's cool, sounds fm-ish. You can just x-fade the saw/tri out. If you've never 
seen this on a scope, too bad. It's cool to look at. Freq won't change, just 
the wave morphing saw/tri. This can be simulated by grabbing your saw and
tri mixer knobs and twisting like mad in opposite directions.....:-)

A more reasonable approach is to use Juergen's pnp/ota x-fade scheme,
two trannys and two otas and you're in business. It can be swept very fast
if that's what you want but I like a moderate to slow transition. Another
wrinkle is to control the transition with something other than a sine/tri and
use other waveforms than saw/tri. Alternately the Serge wave shaper/multi 
also works well and it's even more simple. Am I still screwed up and not
giving a good answer? I'm not sure anymore and I'm going to bed.

Tom (night night) BTW Seq2 lookin' good.