# FMOD ChannelGroup getNumChannels always 0

**URL:** https://qa.fmod.com/t/fmod-channelgroup-getnumchannels-always-0/15743
**Category:** Unity
**Created:** [May 8, 2020, 3:27am UTC](https://qa.fmod.com/t/fmod-channelgroup-getnumchannels-always-0/15743 "2020-05-08T03:27:21Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![aprildd](https://avatars.discourse-cdn.com/v4/letter/a/278dde/32.png) [@aprildd](https://qa.fmod.com/u/aprildd)
#### Post date: [May 8, 2020, 3:27am UTC](https://qa.fmod.com/t/fmod-channelgroup-getnumchannels-always-0/15743/1 "2020-05-08T03:27:21Z")

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Hi guys, my goal is to create an Audio Visualizer and the music have several tracks.I want to add a DSP to every track.  
When i call:

int channelNumber = 0;  
RuntimeManager.CoreSystem.getChannelsPlaying(out channelNumber);

the channelNumber is absolutely correct.but when i call:

ChannelGroup channelGroup;  
RuntimeManager.CoreSystem.getMasterChannelGroup(out channelGroup);

int channelNumber = 0;  
channelGroup.getNumChannels(out channelNumber);

the channelNumber is 0.How can i get each channel to add a DSP?

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### Author: ![cameron-fmod](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/cameron-fmod/32/261_2.png) [@cameron-fmod](https://qa.fmod.com/u/cameron-fmod)
#### Post date: [May 14, 2020, 6:03am UTC](https://qa.fmod.com/t/fmod-channelgroup-getnumchannels-always-0/15743/2 "2020-05-14T06:03:40Z")

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Each of the FMOD functions will return an `FMOD.RESULT` which may help you find the cause.

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<div class="post-metadata">

### Author: ![aprildd](https://avatars.discourse-cdn.com/v4/letter/a/278dde/32.png) [@aprildd](https://qa.fmod.com/u/aprildd)
#### Post date: [May 14, 2020, 6:15am UTC](https://qa.fmod.com/t/fmod-channelgroup-getnumchannels-always-0/15743/3 "2020-05-14T06:15:11Z")

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Thanks!!That helps a lot！