The new 'copy' function seems to overwrite all the pre-existing patterns when you paste into microtonic using 'paste' in the main menu. What am I doing wrong? In the older format (of Patternarium) the copy function immediately downloaded and added the selected pattern to the pre-existing bank.

Sorry for the very late reply. I am not sure what you might have done previously but the copy feature in Patternarium has always copied a full "Microtonic Preset". A preset contains all 24 patterns. Patternarium generates all of these (grouped in different "chain groups", although it only plays the first chain in the browser, starting at pattern A).

However, you can have multiple presets in Microtonic simultaneously (or to be correct, multiple "programs" that consist of patterns, sounds and morph settings). Use the program selection topmost in the window to access these.