The Elf wrote:If anyone has the module I would be interested to know about the compromises it involves.
There are a number of differences along the lines of those Nigel pointed out previously. The Hydrasynth Manual is actually for both the module and keyboard versions and discusses the differences in a few places.
There is a summary on page 9 which says:
It's also extremely friendly to read - one of the nicest manuals I've seen in a long time. I do recommend a glance through it for any prospective buyers; it packs a lot of info into a smallish yet easy to read document.