Yeah, the other filters aren't biquads and don't have IIR coefficients that can be plotted, but I'll add some dummy coefficients to hide this :)

But the Frequency modulation is supposed to work. I'll investigate.

Thats awesome. Makes perfect sense now that the knowledge is there. : ) as with most things.

Thanks again

Escape is the native shortcut for Autocomplete on OS X's Xcode, but this may be not obvious for Windows people :)