This is a fun yet practical module to add to any A100 modular setup. As well as building classic Theremin style pitch control patches, it's great for modulating other things too. For instance I found it great fun to run the antenna horizontally along the width of the keyboard, and then while playing basslines on the keys you could modulate the filter frequency by changing the angle of your hand! There's a lot of fun to be had with this surprisingly cheap module.