Thanks. I’ll check it out.
Basically all I am missing is a constant signal that can be used as the On and Off, like a CV. Unfortunately that translation is lost because each midi key sends a Stop when released.
I think I would actually need a controller that sends a constant of some kind or another, kind of like a latching effect that can be used to filter the Note Off until all keys are released.
Only last played with the variable I added.
A range can be added too.
Doable with Retrokits RK002 I think. I have it too. Midipal / Midibud / Midibro can be also edited.
Bomebox can be appropriated apparently :
conditional execution, e.g. IF pp < 20 THEN do
The variable setup you had did not work for me. There was actually no stops. I had to change the variable to the Y for it to work. Is it working for you? It is working, but it does catch a stop here and there. Maybe I copied the script wrong?
Yes, I need to implement more conditional code. I am going to take a look at Bomebox.
I didn’t test the script I posted here, maybe a mistake, but I did another one and tested it.
I can check it twice and post it !
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You store velocity as variable 1, I don’t think it’s relevant. 
Here is my script :
PATTERN-GATE.rtf (1.5 KB)
Channel 16, only last played note sends Stop.
Setting #1: Map all Note-On events on MIDI channel 16 to Program Change events on MIDI channel 16, with the incoming Note number mapped to the outgoing Program Change number.
Setting #2: Map all Note-On events on MIDI channel 16 to Note-On #35 events on MIDI channel 16, with the incoming velocity mapped to the outgoing velocity value.
Setting #3: With all incoming Note-On events on MIDI channel 16, store the Note number in “variable 1”.
Setting #4: Map all Note-Off events matching the note number in “variable 1” on MIDI channel 16 to MIDI Stop events.
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Tested with OT with a keyboard : works great ! 
Even holding several notes.
Playing patterns with my synced keyboard’s arp !
(Tested with 1/16 at 274 bpm)
In fact I’m not sure to keep Stop function. Maybe I’d prefer a silent pattern.
This can be optional, with certain values.
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Is this using the Midi Event Processor?
Because the Gate Pattern Change on the MDUW was my favorite thing to play with- and this code would actually make me inclined to acquire one
Edit: NVM- Event Processor Plus. Just saw it.
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I thought of that, but according to midi solutions software velocity 0 is the preferred way to map a Note Off. Every time I set Note Off I got the pop up window telling me this, so I thought I would give it a try.
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A silent pattern is definitely an option. I have used that work around before with other gear.
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So did you tried my last script ? 
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I am about to.
Everything works but the Stop, it just never stops. Are you using Octratrack MKI?
From the OT MKII Manual
| “A1 (33)” | “Sequencer Stop” | “A4 (69)” | “Active track down” |
|---|---|---|---|
| “A#1 (34)” | “Sequencer Start” | “A#4 (70)” | “Toggle Seq sync” |
| “B1 (35)” | “Sequencer Restart” | “B4 (71)” | “Toggle Seq sync + start” |
I am not able to perform a Stop using the MIDI Stop function. This is how I ended up using the Velocity 0 as the Note Off function, triggering a Note On #33.
Midi Sync > Transport Receive Checked ?
I have MKI.
MKI and MKII share the same OS. I read about only 1 possible difference between MKI and MKII, related to button combination, so I don’t think that’s due to MKI vs MKII.
Midi sync and Transport Receive are both checked.
The OT responds to incoming clock, and Start / Stop from external transport controls.
I am using Auto Channel 13. I wonder if this has something to do with Auto Channel?
CC Direct connect is also checked, but I don’t think that is relevant.
I checked all of the setting by toggling them on and off. Nothing made a difference. For what ever reason, the OT MKII does not respond to the Midi Stop coming from the EPP.
Surprising, it’s a common midi message. 
Try eventually a dedicated script to test EPP stop.
Or that would mean your OT can’t stop when receiving transport !
So what about “A1 (33)”“Sequencer Stop” ?