THIS IS ONLY AN ISSUE WITH VERY EARLY ZOIAS, NEW ZOIAS have a built in fix.
Here is a guide on how to access the board inside your ZOIA and how to perform the MIDI mod
We're had a handful of customers who have a particular MIDI device that won't play nice with the ZOIA and we've found that jumping across R69 helps
*If you don't have a soldering iron or know someone with one and you need this mod done, we'll be happy to do it
First, you'll need to pull off the back plate with a phillips screwdriver and remove the nuts with a #14 and 1/2" bit
Lay out the board and pedal enclosure like this (you don't need the nuts to be displayed like this)
This is where R69 is
Now add a big solder blob to one end, heat it up again and lay in one end of a wire
Now solder the other side and clip off the excess wire
Now clean up any nasty flux residue with 90-99% isopropyl alcohol and you're done!
It's not pretty but you can check continuity with a multimeter to be sure.
Re-assemble the ZOIA and you should be ready to rock!
If you're still having problems please contact email@example.com and we'll be happy to help.