In the process of establishing my Eurorack setup I've purchased pre-built and kit modules. As I get a sense of what these modules do and what how I can use them, a few are getting sold back. As the real "keepers" get identified, I'll be digging into the finer details of their functionality. The best way (for me) to learn how to use these rather complex devices is to first play around with them, and then later read a printed version of their manuals and make my own notes. As I do this process, this is where I will store my notes.