If you want a great sequential switch for your eurorack rig, the Vice Virga from Noise Engineering packs a ton of power and creativity. But it's not obvious how the steps advance, so this tutorial should help you totally understand how it works, what the LED actually means, and how to get the most out of it.
I recently bought the Vice Virga sequential switch from Noise Engineering - and while it did what I expected for he most simple configurations, it confused me on the multi-input-output configurations and even some simple ones. Luckily, the folks at Noise Engineering are so amazing, I got a detailed description of the behavior of the switch from them and once I tested my understanding on my own patches, I decided to make a slide deck and video to describe the behaviors for other people to understand it better.