Tutorials for waveshaping and generation circuits?

Im interested in learning about active waveshaping and adjustable wave generation circuits, including VCF's and VCA's for the purpose of building an analog synth.

Ive studied all of the basic opamp circuits including integrators, differentiators. Iv also studied the wein bridge , phase shift, and squarewave oscillators, comparators with hysteresis, clipping circuits, dc restoration, peak detectors, active rectifiers, opamp based Pulsewidth modulation circuits, ICL8038, ramp generator , LM566 & LM331.

So Now I need take the next step.
Circuits like the analog part of this schematic is what Im interested in, also LFO,s. I have a pretty good understanding of the previous linked circuit but Im still interested in learning more about the aforementioned type of circuits, so any tutorials or books( Id rather online tutorials though, as I dont have the $$ for...) would be very usefull.

Regards,
jmur

Is there nowhere that I can learn about....?

Those circuits are 30 or 40 years old. Instead of analog, digital signal processing is used and taught today.

Maybe you can find some old books that talk about Applications for Opamps.

Try googling (or looking through the internet) under "Electronic signal processing".

audioguru said:

Those circuits are 30 or 40 years old. Instead of analog, digital signal processing is used and taught today.

Maybe you can find some old books that talk about Applications for Opamps.

Click to expand...

Thanks haven't found any yet but Ill keep looking

potoole64 said:

Try googling (or looking through the internet) under "Electronic signal processing".

Click to expand...

I haven't been any more successful using those keywords, Thanks anyway