The schematics in the PDF you linked to (page 3) has four copies of the standard oscillator, with a diode for CV. Each one looks like this:
(pretty sure R1, D2, and C3 are supposed to be connected, btw, otherwise that thing won’t oscillate; cf the standard schematics I posted earlier)
…and two of the six gates are unused, for no obvious reason (guess he ran out of PCB/front panel space, maybe?):
If you wire them the same way as the others, you have six oscillators.