i41CX+ emulator - how to enter synthetic instructions

[RobertM]

I use a combination of the ZENROM and the i41CX+ file import for all my synthetic programming. ZENROM (as it sounds like you already know) supports direct key synthetic programming (include extra alpha chars). The i41CX+ file import supports many of these as well ... just create a txt file on your computer containing the "E6" or "E2" line, and save/copy it to i41CX+ (I use Dropbox and OneDrive, but there are other options).