Im using ZebraHZ rev 2570, and I'm having an issue with breath input on the mod matrix.
take the default patch, reduce sustain on env 1 to zero, and shorten decay
put in mod matrix, : breath, full mode, target ENV1:sustain.
it should then sustain the note if breath input, but it doesnt.
I can see midi data going into ZHZ from breath, also if I learn breath to XY i can see it.
if i switch over the mod matrix to aftertouch, or mod wheel it works as expected.
(even if the mod wheel event is generated by my breath pipe
if i do exactly the same in Zebra2, it works as expected for breath
a known issue?
EDIT: i can also confirm breath works as expected on 2.6.1 REV 1593 of ZebraHZ
