Parametric Equalizer

how do I get this effect to ‘notch’?

If you are talking about the native Para EQ in AA, then select V or inverted V shape and use only one band., then use the Q to expand/contract the range by dragging the node and using the handlebars.

I have one band selected. Where do I select the v or inverted v from?

If you need more visual control, head over to FabFilter Pro Q2

https://www.fabfilter.com/products/pro-q-2-equalizer-plug-in

How’s that working for you @David