# Which method initiates functions of AudioProcessor class?

**URL:** <https://forum.juce.com/t/which-method-initiates-functions-of-audioprocessor-class/38259>\
**Category:** General JUCE discussion\
**Created:** [March 25, 2020, 2:51pm UTC](https://forum.juce.com/t/which-method-initiates-functions-of-audioprocessor-class/38259 "2020-03-25T14:51:54Z")\
**Posts on this page:** 1\
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**Author:** ![moijuce](https://avatars.discourse-cdn.com/v4/letter/m/ecd19e/32.png) [@moijuce](https://forum.juce.com/u/moijuce)\
**Post date:** [March 26, 2020, 6:51am UTC](https://forum.juce.com/t/which-method-initiates-functions-of-audioprocessor-class/38259/3 "2020-03-26T06:51:28Z")

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I’m trying to build a plugin, which plays a midi-file, using this thread and files: [Playing a MIDI file (revisited)](https://forum.juce.com/t/playing-a-midi-file-revisited/26646). As I understand the playback is realized via processBlock method. So far my midi-file is read fine, but processBlock is not working.

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