# Redefine PLUG\_CHANNEL\_IO

**URL:** <https://iplug2.discourse.group/t/redefine-plug-channel-io/579>\
**Category:** Made with iPlug2\
**Created:** [24 February 2022 19:29 UTC](https://iplug2.discourse.group/t/redefine-plug-channel-io/579 "2022-02-24T19:29:44Z")\
**Posts on this page:** 4\
**Page:** 2

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**Author:** ![stw](https://avatars.discourse-cdn.com/v4/letter/s/8e8cbc/32.png) [@stw](https://iplug2.discourse.group/u/stw)\
**Post date:** [6 March 2022 19:58 UTC](https://iplug2.discourse.group/t/redefine-plug-channel-io/579/21 "2022-03-06T19:58:22Z")

</div>

Congrats 🙂 !  
I don’t think that this PR was already merged because it’s still open. Oli mentioned that he wanted to test some more…

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**Author:** ![wcr\_hlo](https://yyz2.discourse-cdn.com/free1/user_avatar/iplug2.discourse.group/wcr_hlo/32/231_2.png) [@wcr\_hlo](https://iplug2.discourse.group/u/wcr_hlo)\
**Post date:** [15 March 2022 19:15 UTC](https://iplug2.discourse.group/t/redefine-plug-channel-io/579/22 "2022-03-15T19:15:21Z")

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Hello again, I conducted tests and I have found the following:

When I choose the IO routes like this:

![Screenshot 2022-03-15 at 19.49.14](https://global.discourse-cdn.com/free1/uploads/iplug2/original/1X/18157ecd5e0a7148193f2b845ce8aeaf40cee8a2.png)

There’s the unprocessed sound going through to the outputs, bypassing the plugin.

When instead I choose the routes like this:

![Screenshot 2022-03-15 at 19.56.06](https://global.discourse-cdn.com/free1/uploads/iplug2/original/1X/cd33aff3a3e25009d8a788a76f13c693e4b1198d.png)

Then the sound is actually processed.

The IO config:

AU,VST3

```auto
#define PLUG_CHANNEL_IO "\ 
2-2 \ 
2.2-2"

```

Does anyone know why it could behave this way?

Also, if I change the IO to this:

```auto
#define PLUG_CHANNEL_IO "\ 
1-1 \ 
1.1-1 \ 
1.2-1 \ 
1.2-2 \ 
2.1-1 \ 
2.1-2 \ 
2-2 \ 
2.2-2"

```

Then all the routes are marked as Sidechain.

![Screenshot 2022-03-15 at 19.38.22](https://global.discourse-cdn.com/free1/uploads/iplug2/original/1X/c8dbfa02c90f84b684e894d1c1fbab53f1c550c8.png)

Does anyone have an idea what could be the reason for this?

P.S.  
Also, this config for Reaper (only) works fine:

```auto
#define PLUG_CHANNEL_IO "\
1-1 \
1.1-1 \
1.2-1 \
2.1-2 \
2-2 \
2.2-2 \
4-4 \
4.1-4 \
4.2-4"

```

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<div class="post-metadata">

**Author:** ![wcr\_hlo](https://yyz2.discourse-cdn.com/free1/user_avatar/iplug2.discourse.group/wcr_hlo/32/231_2.png) [@wcr\_hlo](https://iplug2.discourse.group/u/wcr_hlo)\
**Post date:** [18 March 2022 17:03 UTC](https://iplug2.discourse.group/t/redefine-plug-channel-io/579/23 "2022-03-18T17:03:23Z")

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> <https://github.com/iPlug2/iPlug2/issues/856>
>
> I apologize in advance for the meager description, but the facts are described i…n the topic along with the photo. I think this is a separate bug.
> 
> First - https://github.com/iPlug2/iPlug2/issues/846
> 
> Second:
> 
> Type plugin: compressor
> Configuration for Reaper (only) works fine (AUv2, VST3 the sidechain does not work when setting 4-4 channels):
> 
> \`\`\`
> \#define PLUG\_CHANNEL\_IO "\\
> 1-1 \\
> 1.1-1 \\
> 1.2-1 \\
> 2.1-2 \\
> 2-2 \\
> 2.2-2 \\
> 4-4 \\
> 4.1-4 \\
> 4.2-4"
> \`\`\`
> 
> Place this config in a compressor with a side chain. Compile the plugin in AU v2 and VST3 format. Turn on the side chain, or select 4 channels in the Reaper.

It seems that we are dealing with two issues.

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<div class="post-metadata">

**Author:** ![olilarkin](https://yyz2.discourse-cdn.com/free1/user_avatar/iplug2.discourse.group/olilarkin/32/2_2.png) [@olilarkin](https://iplug2.discourse.group/u/olilarkin)\
**Post date:** [18 March 2022 17:22 UTC](https://iplug2.discourse.group/t/redefine-plug-channel-io/579/24 "2022-03-18T17:22:27Z")

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Please stop @ting us

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