Bachus I must politely disagree. BK-7m is still considered a current product, and not obsolete by any means. SD40 on the other hand is like a unicorn. Never saw one in person, not many places you can buy one, perhaps only one person in the USA who can fix if it has a failure. Major unannounced changes in OS updates, such as changes to chord fingering(!), see below:

http://www.synthzone.com/forum/ubbthread...with#Post391871

And then it was quickly orphaned by the SD60/90. Believe me I read the Ketron forum pretty closely when this module was new. I personally can't stomach the risk associated with their products. Others may disagree but AFAIC, caveat emptor. A shame really, because I do agree that there should be more choices in arranger modules.