# MOD-UI on Vangelis 2610

**URL:** <https://discourse.zynthian.org/t/mod-ui-on-vangelis-2610/13779>\
**Category:** Software\
**Tags:** v5, mod-ui, vangelis\
**Created:** [October 20, 2026, 10:32am UTC](https://discourse.zynthian.org/t/mod-ui-on-vangelis-2610/13779 "2026-10-20T10:32:01Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![dmtry3](https://discourse.zynthian.org/user_avatar/discourse.zynthian.org/dmtry3/32/16907_2.png) [@dmtry3](https://discourse.zynthian.org/u/dmtry3)\
**Post date:** [October 20, 2026, 10:32am UTC](https://discourse.zynthian.org/t/mod-ui-on-vangelis-2610/13779/1 "2026-10-20T10:32:01Z")

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```auto
Hi! Could you please tell me if MOD-UI is compatible with Vangelis 2610 on Zynthian v5?
After adding a chain with MOD-UI, the interface stops working, and I’m seeing these errors:

```

Oct 20 11:30:57 zynthian systemd[1]: mod-ui.service: Failed with result ‘exit-code’.  
Oct 20 11:30:59 zynthian systemd[1]: mod-ui.service: Scheduled restart job, restart counter is at 29.  
Oct 20 11:30:59 zynthian systemd[1]: Started mod-ui.service - MOD-UI.  
Oct 20 11:30:59 zynthian mod-ui.sh[8400]: WARN: Missing file /zynthian/zynthian-sw/mod-ui/data/mod\_api\_key.pub with the public API KEY  
Oct 20 11:30:59 zynthian mod-ui.sh[8400]: Traceback (most recent call last):  
Oct 20 11:30:59 zynthian mod-ui.sh[8400]: File “/zynthian/zynthian-sw/mod-ui/./server.py”, line 54, in  
Oct 20 11:30:59 zynthian mod-ui.sh[8400]: from mod import webserver  
Oct 20 11:30:59 zynthian mod-ui.sh[8400]: File “/zynthian/zynthian-sw/mod-ui/mod/webserver.py”, line 31, in  
Oct 20 11:30:59 zynthian mod-ui.sh[8400]: from tornado import gen, iostream, web, websocket  
Oct 20 11:30:59 zynthian mod-ui.sh[8400]: ModuleNotFoundError: No module named ‘tornado’

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**Author:** ![jofemodo](https://discourse.zynthian.org/user_avatar/discourse.zynthian.org/jofemodo/32/2_2.png) [@jofemodo](https://discourse.zynthian.org/u/jofemodo)\
**Post date:** [October 20, 2026, 8:39pm UTC](https://discourse.zynthian.org/t/mod-ui-on-vangelis-2610/13779/2 "2026-10-20T20:39:53Z")

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Ups!! I totally forgot about MOD-UI.

You could say not, it’s not supported in Vangelis, at least currently.

I would take a look and fix it if it’s not too complex, but don’t expect too much support from developers.

Regards

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**Author:** ![riban](https://discourse.zynthian.org/user_avatar/discourse.zynthian.org/riban/32/2331_2.png) [@riban](https://discourse.zynthian.org/u/riban)\
**Post date:** [October 20, 2026, 8:50pm UTC](https://discourse.zynthian.org/t/mod-ui-on-vangelis-2610/13779/3 "2026-10-20T20:50:31Z")

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Mod-ui should no longer be required. There is (almost) nothing that you can do in mod that you can’t also do with zynthian chains, hence we did not validate its functionality. I guess something broke in Trixie. Maybe we should drop it now?

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**Author:** ![dmtry3](https://discourse.zynthian.org/user_avatar/discourse.zynthian.org/dmtry3/32/16907_2.png) [@dmtry3](https://discourse.zynthian.org/u/dmtry3)\
**Post date:** [October 21, 2026, 3:07am UTC](https://discourse.zynthian.org/t/mod-ui-on-vangelis-2610/13779/4 "2026-10-21T03:07:24Z")

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Good afternoon!  
I see, thanks! I don’t actually have any need for it, though )

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**Author:** ![ernst](https://discourse.zynthian.org/letter_avatar_proxy/v4/letter/e/9f8e36/32.png) [@ernst](https://discourse.zynthian.org/u/ernst)\
**Post date:** [October 21, 2026, 5:20pm UTC](https://discourse.zynthian.org/t/mod-ui-on-vangelis-2610/13779/5 "2026-10-21T17:20:35Z")

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Good afternoon,

even it is already a week congratulations to everyone for the great Vangelis release! For a simple layman it is incredible how intuitive Zynthian has become over the last years!

With respect to MOD-UI:

I recently happened to test Moony for pure curiosity (build a non linear cc2 scaler for my EWI) and if my memory doesn’t fail me C1A1xC1A1 in my old V4 /Oram/ MOD-UI showed a usable knob, whereas for the normal Zynthian on V5/Vangelis I needed to use C2A1 for one, and C4A1 to get three knobs to parametrize e.g. the CC2 response curve. Not a problem, just an observation. (Used Patchage to link Moony in Vangelis, not sure about MOD-UI.)

Kind regards,

Ernst