Doepfer

> http://search.retrosynth.com/synth-diy/search/lookit.cgi?-v0805.169

Dammit! Don't you just hate being thwarted by technology? There's 
something 'dynamic' I don't understand about that link that 
gives 'internal server error' (well it does for me!), but if you then 
back arrow out, and forward arrow back in it may work...

Or else go to:

http://search.retrosynth.com/synth-diy/

and search on 'shift register sequence period', it's near the end of 
the thread, on 9th May.

Tim