Many thanks for your question. There are 8 divisional pistons on each division, each with 8 levels of memory, and 8 General pistons with 128 levels of memory accessible via the registration sequencer. I have posted some further updates on my website showing an image of the real console, and the main virtual console layout showing the piston layouts.
https://www.audioangelorum.com/DBPage.asp?PageNumber=100023
https://www.audioangelorum.com
The registration sequencer and divisional memories are faithfully reproduced in the organ definition to allow the virtual console to function as per the real console.