Filter ICs and crossfade circuits

[Michael Potas]

I have noticed that most state variable filter circuits use the CA3080 and not the LM13600.  Do the CA3080s sound better?  The LM13600s work out much cheaper, having dual OTAs and buffers in the same package,  compared to just a single OTA for about the same price. They also taking up a lot less PCB space to implement.


I want to build a CV controlled crossfade circuit.  The idea is that I can smoothly fade between two input waveforms to create a single output waveform.  Hence using say Trig and square wave inputs, you can morph between one and the other using CV.  My plan is to use two  VCAs fed an opposite polarity CV signal.  Has anyone done this, and does it work OK?

Cheers,

Michael