# Need output from bandpass filter

**URL:** <https://discourse.processing.org/t/need-output-from-bandpass-filter/18214>\
**Category:** Libraries\
**Created:** [February 28, 2020, 1:42pm UTC](https://discourse.processing.org/t/need-output-from-bandpass-filter/18214 "2020-02-28T13:42:57Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![stupidquestion](https://avatars.discourse-cdn.com/v4/letter/s/db5fbb/32.png) [@stupidquestion](https://discourse.processing.org/u/stupidquestion)\
**Post date:** [February 28, 2020, 1:42pm UTC](https://discourse.processing.org/t/need-output-from-bandpass-filter/18214/1 "2020-02-28T13:42:57Z")

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I need to get at least a number (preferably amplitude/loudness) from a bandpass filter. right now I’m just using the processing sound library. is this adequate? if so; how do I do this?  
can I do this multiple times in the same loop with different bandpass filters?

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**Author:** ![matheplica](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.processing.org/matheplica/32/21035_2.png) [@matheplica](https://discourse.processing.org/u/matheplica)\
**Post date:** [March 4, 2020, 2:52pm UTC](https://discourse.processing.org/t/need-output-from-bandpass-filter/18214/2 "2020-03-04T14:52:24Z")

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You can try : [amplitude example](https://processing.org/reference/libraries/sound/Amplitude.html)