Here are Andrew's build notes:
EMW from Brazil have also done a 1050 module
EMW Mix sequencer (Sonic state review)
Back to the NLC build:
Some pics of the virgin PCB & Panel
Get those ICs on first. These are 0805s
The sequencer section uses one CD 4017 (decade counter) , three CD4071s (quad 2-input OR gate) and one CD 4081 (CMOS Quad 2-input AND gate).
A bit about gates.
CD4071 (quad 2-input OR gate)
CD 4081 (CMOS Quad 2-input AND gate).
This is the truth table for the AND gate