VsigX is not an option. AFAIK, it doesn't work with the recent versions of the harmonizers' software, neither 5.3 nor 5.5.
I had to install a Windows on my Mac, then Vsig to edit patches.
But to download them from/to the unit, I had to use the units's MIDI SysEx commands. At the time, I didn't manage to use the USB/serial adapter from a Windows on my Mac.
I hope you don't have to do that.
