The stereo audio jacks have three pins. The longest pin in the middle is wired to ground and the two shorter pins are wired to the left and right audio signals.

Cut, splice and tin five pieces of stranded core wire that are approximately 35 mm in length.

Solder the first audio jack's ground pin to the first potentiometer's ground pin.

Solder the remaining four audio jacks' ground pins to their corresponding potentiometer's ground pin.

Cut, splice and tin four pieces of stranded core wire approximately 40 mm in length.

Solder the wire from the first audio jack's left channel input (marked 3 on the jack) to the first potentiometer's front wiper (middle) pin.

Solder the remaining three input jacks' left channels to their corresponding potentiometer's front wiper pin.

Cut, splice and tin four pieces of stranded core wire approximately 35 mm in length.

Solder the wire from the first audio jack's right channel input (marked 2 on the jack) to the first potentiometer's back wiper (middle) pin.

Solder the remaining three input jacks' right channels to their corresponding potentiometer's back wiper pin.

Cut, splice and tin two pieces of stranded core wire; one approximately 35 mm in length and one approximately 40 mm in length.

Solder the longer wire from the output jack's left channel pin (marked 3 on the jack) to the output potentiometer's back output pin.

Solder the shorter wire from the output jack's right channel pin (marked 2 on the jack) to the output potentiometer's front output pin.