This post reminded me of something I wanted to check. Z3TA+2 has a powerful arpeggiator... I am not sure if it transmits those with enable MIDI output (or having Z3TA itself not fire but still pass the MIDI output).
On-topic, I have read that only Project 5 can create the .ARP files, but some folks here do have that up and running (I think).
Update: I revisited the prospect of using the arpeggiator in Z3TA+2 and the idea was not achievable in any method that I tried. It appears it only passes the original MIDI notes through and the engine itself creates the arpeggiated audio from them (not arpeggiated MIDI output).