The SWAH is an AutoWah with control for sensitivity, Bias and Decay.
The dimensions of the pcb are 63x55mm.
This project is by GuitarPCB.com, in cooperation with Musikding. For any technical problem relating to building this project, please contact Barry at GuitarPCB.com forum.
You get full technical support at the GuitarPCB.com forum. There is even more detailed build information available there:
Here is the direct link to the building docs, including layout and schematic: