Step 14: Controlling Gain -- Easy Way
Careful examination of the PCB will reveal two pads just above pins 1 and 8 of the LM386. By joining these two pins with a piece of wire, the gain will be set to 200 and the ATS will be considerably louder. The datasheet for the LM386 indicates a 10uF capacitor should join these pins and that pin 7 needs a bypass capacitor. I have not noticed any problems with a simple wire.
This is the easy way to modify the gain. A more elegant and complicated approach is detailed on the next page.