# Midi Effect Plugin Jucer option having no effect?

**URL:** <https://forum.juce.com/t/midi-effect-plugin-jucer-option-having-no-effect/19408>\
**Category:** General JUCE discussion\
**Created:** [October 8, 2016, 4:40pm UTC](https://forum.juce.com/t/midi-effect-plugin-jucer-option-having-no-effect/19408 "2016-10-08T16:40:27Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![leehu](https://sea2.discourse-cdn.com/flex026/user_avatar/forum.juce.com/leehu/32/3280_2.png) [@leehu](https://forum.juce.com/u/leehu)\
**Post date:** [October 8, 2016, 4:40pm UTC](https://forum.juce.com/t/midi-effect-plugin-jucer-option-having-no-effect/19408/1 "2016-10-08T16:40:28Z")

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Hi, even if I check the option in Jucer I get an assertion when trying to load the VST:

 ![](https://us1.discourse-cdn.com/flex026/uploads/juce/original/2X/8/8a14d29267709ac600606832e4d0fee8ca6bd0a1.png)

Cheers

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**Author:** ![fr810](https://sea2.discourse-cdn.com/flex026/user_avatar/forum.juce.com/fr810/32/841_2.png) [@fr810](https://forum.juce.com/u/fr810)\
**Post date:** [October 9, 2016, 6:37pm UTC](https://forum.juce.com/t/midi-effect-plugin-jucer-option-having-no-effect/19408/2 "2016-10-09T18:37:37Z")

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Did you also override the isMidiEffect callback in your AudioProcessor?

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<div class="post-metadata">

**Author:** ![leehu](https://sea2.discourse-cdn.com/flex026/user_avatar/forum.juce.com/leehu/32/3280_2.png) [@leehu](https://forum.juce.com/u/leehu)\
**Post date:** [October 9, 2016, 6:51pm UTC](https://forum.juce.com/t/midi-effect-plugin-jucer-option-having-no-effect/19408/3 "2016-10-09T18:51:37Z")

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Hi - ah, no.

I’ll give that a go - is there any reason that Jucer doesn’t do that if the option is selected? I’m assuming I return true from that, so is there a circumstance where I’d return false?

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**Author:** ![willrice](https://sea2.discourse-cdn.com/flex026/user_avatar/forum.juce.com/willrice/32/55_2.png) [@willrice](https://forum.juce.com/u/willrice)\
**Post date:** [October 10, 2016, 1:30pm UTC](https://forum.juce.com/t/midi-effect-plugin-jucer-option-having-no-effect/19408/4 "2016-10-10T13:30:45Z")

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What file is that assertion in?

I’ve searched extensively through the develop branch as it stands and failed to find any instance of the string “You must at least have some channels”.