This was my issue as well.

I thought I was looking at something like Ableton Live's session view, where each cell could be a mathematical function or any instruction a spreadsheet offers.

I clicked only on the A1 "$t"-cell, so obviously I didn't hear anything.

Yep, and the cell furthest down in any column contains the loop that makes the sound repeat.

What about the whole composition? Or is that not what this is about?