I have no idea what’s up with that bias circuit, I haven’t seen anything like it before.
Here’s another 4024 based divider whose reset input is conditioned by two transistor stages, but without any such bias circuit.
(Does it really need four diodes for reset though?)
Never mind, I went back and looked at Rönnberg’s page (Niklas R�nnberg's homepage - Audio DIY) and it says
It’s original design was made by Mathias Herrmann for his inspiring Fonitronik. However, his design gives inverted outputs, which I changed to normalized outputs. Also I added a start-up reset pulse, to ensure that all outputs are low when the modular is started.
So the “bias circuit” is actually that startup pulse: When power is applied, the center left transistor turns on and kicks the reset input. The rest is a pair of inverting buffers to condition the input pulses, as said.
Fonitronik’s design: http://www.modular.fonik.de/pdf/SimpleDividerSCH.pdf