Step 4: The Schematics
If you don't know how to read schematics, don't worry! Just pay attention to the notes on the images. You would be better off looking up how to read schematics, though, just to be safe.
Pay attention to the back of the LM741 package for the terminal numbers, if you get those wrong you could cook the amp. All the numbers on the schematic are right, just placement is funny, because the amp is a rectangle, while the schematic amp is a triangle. Don't ask my why... I didn't invent schematics.
When grounding, solder a stripped wire across most of the perf board, and when you ground something, just attach it to that. That will count as your ground, no need to solder it to the case!
NOTE: The second schematic is just how to wire the switches to the op amp, so you will still have to use the resistors from the first schematic. I made two different schematics because I knew people would want to use their own switch layout. This way they can see how the switches work.
For the 1/4" jacks, there should be two terminals coming off across from each other. If you look carefully, you can see that one is attached to the long contact while the other is attached to the entrance to the jack. Connect the one at the entrance to ground, and the other pin to where the schematic says (in=pin 2 out=pin 6)