AudioMatt

On wikipedia's biquad page, the block diagrams have no a0. I get that. (just normalize everything so you get a one in front of the function)

In max, biquad (and gen.biquad) don't have b0. What's the deal here?

(Sorry, I'm sure this is a stupid question but I'm hoping the internet can save me a weeks worth of hair pulling)

I'm working my way through   RBJ's Cookbook
On wikipedia's biquad page, the block diagrams have no a0.  I get that.  (just normalize everything so you get a one in front of the function)  

In max, biquad (and gen.biquad) don't have b0.  What's the deal here?

(Sorry, I'm sure this is a stupid question but I'm hoping the internet can save me a weeks worth of hair pulling)


quick-stupid-filterdesign-question

I think the deal is that some representations of the biquad equation use a0, a1, a2, b1, and b2 (Max's documentation) and some flip it and use b0, b1, b2, a1, and a2 (Wikipedia).

Quick Stupid filterdesign question