The werkstatt looks like it’d sound really wicked with the NS1!!
The sensor blocks are supposed to be used like a breadboard. It’s just to add extra components and connections onboard. I was super confused by them when I first got it as well.
I have never used the stock firmware, but if you do end up using Arduino, digital pin 4 is connected to the power rail and the DAC IC. Not sure what it does because I haven’t used the DAC yet.