Had a sit down and made a proper effort to understand how to make use of the PLL today.
if you can find the right ins and outs and knob positions and switch selections ... you can actually make it sing along.
There's only an 8 step sequence in this demo snippet.
The sine is the basic sound, which is fed into the PLL & we hear both the sine and PLL square wave at the top of the mix (which I also crammed through a filter, obvs)