K8032 Looplight: How to make it slower



I bought the Kit K8032. It is a running light and I can adjust the speed from 0.2 to 3 Hz. I want to make the loop slower, for instance between 0.05 to 0.2 Hz. I guess that I can replace a capacitor to have a wider range. Which capacitor do I have to replace with which capacity?

Thank you for your answers!

Cheers, Stefan