The wire? Are you talking about the one of the sync O0->O2
This wire details and schematic are only for people who wants to make their own board, don't follow this.
Obviously this wire is a track on your board!
This is the schematic of your board:
The shop where you got the components is an old one, no? :)
You used disc caps, this is vintage ! ;)
JP3/4/5 are for expansion(AUX), you will not use the AUX pins, then it doesn't matter here ;)
Beautiful pictures thank you for sharing it :)
You're very close to get it sounding now!