# DSP Ladder Filter no sound using synth

**URL:** <https://forum.juce.com/t/dsp-ladder-filter-no-sound-using-synth/41933>\
**Category:** Audio Plugins\
**Created:** [September 28, 2020, 4:44am UTC](https://forum.juce.com/t/dsp-ladder-filter-no-sound-using-synth/41933 "2020-09-28T04:44:02Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Brahoule](https://avatars.discourse-cdn.com/v4/letter/b/f0a364/32.png) [@Brahoule](https://forum.juce.com/u/Brahoule)\
**Post date:** [September 28, 2020, 4:44am UTC](https://forum.juce.com/t/dsp-ladder-filter-no-sound-using-synth/41933/1 "2020-09-28T04:44:02Z")

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Hi!  
I try to build my first plugin in JUCE and I wanna apply a Ladder Filter to my Synthesiser that play wave files and for some unknown reason at the moment I cant find why I cant get any sound when I use;  
processorChain.process(dsp::ProcessContextReplacing(block));  
not sure how to debug this… A bit of help would be much appreciated.

btw, the synth part is working fine and the IIR Filter also working but i want to replace it by the Ladder one. Also if possible to remove the ProcessorChain and use the dsp::LadderFilter method instead. juce::dsp::ProcessorChain\<dsp::LadderFilter, dsp::Gain\> processorChain;  
I use the DSPModulePluginDemo as reference but in the demo they only use the Ladder with ProcessorChain and with all these filters in this demo the code is hard to understand. i can post my code if i need too.

thanks!

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<div class="post-metadata">

**Author:** ![Brahoule](https://avatars.discourse-cdn.com/v4/letter/b/f0a364/32.png) [@Brahoule](https://forum.juce.com/u/Brahoule)\
**Post date:** [September 28, 2020, 5:39pm UTC](https://forum.juce.com/t/dsp-ladder-filter-no-sound-using-synth/41933/2 "2020-09-28T17:39:37Z")

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NVM! i found the issue… 12 hours later but its working!!