Having a go at Tim Stinchcombe's Switched Capacitor Voltage Controlled Filter. I got a bit overly entusiastic and grafted Tom Henry's front end to the 4046 from his VCO into it... Not so successful, a closer look at what is happening inside the 4046 and it becomes a bit more apparent that I should have left it alone! Anyway it shouldn't be too hard to put it back to the original design...
