Vst Synth parameter automation

If I drag a vst effect into the effects chain I can alter its parameters using the sliders.
How do I change a parameter inside a vst instrument?
For instance. I have a vst instrument that I want to sweep the cutoff or resonance up and down over my pattern length.
How do I achieve this please.

There is an internal DSP effect called Instrument Control Device / Instrument Automation that allows you to control parameters of a VST instrument.

Excellent. Job done. Thankyou.