I've been working on a post explaining some of the unique philosophy of Buchla Modules and, in particular, the 250e sequencer. It's clearly going take a little more time and in the process I posted on a forum for some advice and hints. The great 7th Dan has been very helpful and in fact has a series of instructional videos on 200e modules among other things so while I'm still working I thought i'd give him some press here.
His Blog is here: http://www.niklaswinde.com/index.html
For those not entirely interested in detailed how to videos there are also things like this video as well as some pretty handsome cat pics. Something for all synth geeks!