the computer is connected to the Juno-66 midi in via a midi interface. This might be a USB midi interface, but anything will do.
Scala comes with a sysex uploader tool. MegaMid on pc, I don’t know which one on OSX.
ps unrelated question, you say Juno 60 memory banks still work in 66 but without memorizing new features. But after 66 install, are the memory factory presets still installed, or are these wiped and need to be reinstalled with tape? thx
The memory banks are not wiped, no need to use the tape interface.