As Koan says for some reason chains do not cycle to the next pattern when scale page setting for the active pattern is set to ‘advanced’. I am not sure if thats just how it works, if it says that in the manual, or if its a bug?
But if anyone else is having this problem where the chain mode or song mode is lit up (active) and its not cycling through the chain of patterns as you would expect, but is instead looping on the first pattern or stopping its cycle and looping at a ‘seemingly random’ pattern over and over, then I would recommend to:
1)make sure pattern playback is set to sequential, and
2)change the pattern scale to ‘normal’ mode rather than advanced mode.
What is strange is I am not sure whether the chains are supposed to work in advanced mode or not. I don’t see why it wouldn’t just play to the longest length and switch to the next pattern, but I guess if you have poly rhythms between tracks it could be tricky for the machine to do this? Or maybe its a bug? No idea on that front. But I will say if you ever encounter this issue and dont know whats going on it can be really frustrating so hope this helps someone.
I had this problem on the analog four mkII OS 1.51B