# Scheps Omni Channel external sidechain **URL:** \ **Category:** Support\ **Created:** [April 22, 2020, 11:19am UTC](https://forum.waves.com/t/scheps-omni-channel-external-sidechain/1260 "2020-04-22T11:19:05Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![Ayahuasca](https://avatars.discourse-cdn.com/v4/letter/a/dec6dc/32.png) [@Ayahuasca](https://forum.waves.com/u/Ayahuasca)\ **Post date:** [April 22, 2020, 11:19am UTC](https://forum.waves.com/t/scheps-omni-channel-external-sidechain/1260/1 "2020-04-22T11:19:06Z")
Hi, I am a big fan of this plugin that I use in almost all of my projects. Today for the first time, I encountered a weird issue: the external sidechain feature is greyed out and I can’t use it anymore. Anybody has an idea what’s wrong? I looked at my other projects and this feature has disappeared there as well. ![image](https://canada1.discourse-cdn.com/flex027/uploads/waves/original/1X/1fb00d446ea7839ba050026537cd81b379a7001d.png) ---
**Author:** ![Synetos](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.waves.com/synetos/32/271_2.png) [@Synetos](https://forum.waves.com/u/Synetos)\ **Post date:** [April 22, 2020, 2:55pm UTC](https://forum.waves.com/t/scheps-omni-channel-external-sidechain/1260/2 "2020-04-22T14:55:48Z")
Have you activated it on the menu, and setup SC Inputs? I dont use it much, but that part looks different from the manual screenshots. Maybe a new thing? ---
**Author:** ![Ayahuasca](https://avatars.discourse-cdn.com/v4/letter/a/dec6dc/32.png) [@Ayahuasca](https://forum.waves.com/u/Ayahuasca)\ **Post date:** [April 22, 2020, 3:12pm UTC](https://forum.waves.com/t/scheps-omni-channel-external-sidechain/1260/3 "2020-04-22T15:12:26Z")
It’s not different, it’s just the expanded view of the compressor section. I have been using this feature for a while and it always worked fine before. You have to click the “ext sc” button at the bottom of the compressor module, then you set up your side chain input (in my DAW, Reaper, I just drag the routing icon to the “ext sc” button) and it’s done. Except now, the “ext sc” button can no longer be highlighted, it is greyed out, inactive. 😕 ---
**Author:** ![Synetos](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.waves.com/synetos/32/271_2.png) [@Synetos](https://forum.waves.com/u/Synetos)\ **Post date:** [April 22, 2020, 3:33pm UTC](https://forum.waves.com/t/scheps-omni-channel-external-sidechain/1260/4 "2020-04-22T15:33:48Z")
This is what I meant. If I turn it off, EXT SC goes gray. ![scheps](https://canada1.discourse-cdn.com/flex027/uploads/waves/original/1X/93f49839bdb05be83078ee64defd2a19c6134e8c.png) ---
**Author:** ![Ayahuasca](https://avatars.discourse-cdn.com/v4/letter/a/dec6dc/32.png) [@Ayahuasca](https://forum.waves.com/u/Ayahuasca)\ **Post date:** [April 22, 2020, 4:04pm UTC](https://forum.waves.com/t/scheps-omni-channel-external-sidechain/1260/5 "2020-04-22T16:04:57Z")
Oh I see… Well I don’t know what this is, it is DAW-dependant I think. I don’t have it. ![image](https://canada1.discourse-cdn.com/flex027/uploads/waves/original/1X/184ec4a0eae44f3c761993e49fa52f6a068a7c70.png) ---
**Author:** ![YishaiWaves](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.waves.com/yishaiwaves/32/92_2.png) [@YishaiWaves](https://forum.waves.com/u/YishaiWaves)\ **Post date:** [April 23, 2020, 10:44am UTC](https://forum.waves.com/t/scheps-omni-channel-external-sidechain/1260/6 "2020-04-23T10:44:43Z")
Hi @Ayahuasca! Welcome to the forum! Reaper requires a specific setup for stereo side chaining: We’ll set the Vocal Track to receive the sidechain from a playback stereo track: 1. Click on the track’s “ **Route** ” button. Set “ **Track Channels** ” to “ **4** ”. This will enable the track to receive stereo signals from other channels. ![](https://s3.amazonaws.com/cdn.freshdesk.com/data/helpdesk/attachments/production/3021502029/original/image004.png?1471389464) 2. Drag “Route” button from the track you wish to send in to the sidechain on to the “Route” button on the track with Omni Channel. ![](https://s3.amazonaws.com/cdn.freshdesk.com/data/helpdesk/attachments/production/3021502028/original/image002.png?1471389463) 3. This will create a new Send track going from the Music Track to Vocal Track (in our example). Set Audio 3/4. Omni Channel’s sidechain will receive from 3/4 in the next steps. ![](https://s3.amazonaws.com/cdn.freshdesk.com/data/helpdesk/attachments/production/3021502032/original/image005.jpg?1471389464) _You can choose between “Post Fader” or “Pre Fader”, and determine the gain._ 4. In the Omni Channel window, click on “4 in 2 out” (Or 1 in 2 out if it’s Mono) in order to open the “ **Plug-In Pin Connector** ”. ! 5. We’ll need to connect **3** and **4** to “ **Stereo Aux** ” in the patch. (Not to **Stereo In** because that’s the input, not the sidechain’s / auxiliary’s input) ![](https://s3.amazonaws.com/cdn.freshdesk.com/data/helpdesk/attachments/production/3021502030/original/image008.png?1471389464) Now you should see the “Ext SC” option in Scheps Omni Channel. Hope this helps! Yishai ---
**Author:** ![Ayahuasca](https://avatars.discourse-cdn.com/v4/letter/a/dec6dc/32.png) [@Ayahuasca](https://forum.waves.com/u/Ayahuasca)\ **Post date:** [April 23, 2020, 11:26am UTC](https://forum.waves.com/t/scheps-omni-channel-external-sidechain/1260/7 "2020-04-23T11:26:29Z")
Thanks Yishai. The last step actually “unlocked” the ext sc feature. Now this is a mystery to me: how have I been able to use this before without any issue… without ever having to do that last step? ---
**Author:** ![YishaiWaves](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.waves.com/yishaiwaves/32/92_2.png) [@YishaiWaves](https://forum.waves.com/u/YishaiWaves)\ **Post date:** [April 26, 2020, 9:47am UTC](https://forum.waves.com/t/scheps-omni-channel-external-sidechain/1260/8 "2020-04-26T09:47:34Z")
I cannot explain that @Ayahuasca🤔 ---
**Author:** ![Dillonz](https://avatars.discourse-cdn.com/v4/letter/d/71c47a/32.png) [@Dillonz](https://forum.waves.com/u/Dillonz)\ **Post date:** [August 14, 2020, 3:17pm UTC](https://forum.waves.com/t/scheps-omni-channel-external-sidechain/1260/9 "2020-08-14T15:17:18Z")
you need to use VST3. I had the same issue ---
**Author:** ![thisismattdiamond](https://avatars.discourse-cdn.com/v4/letter/t/43a26b/32.png) [@thisismattdiamond](https://forum.waves.com/u/thisismattdiamond)\ **Post date:** [November 29, 2022, 8:56pm UTC](https://forum.waves.com/t/scheps-omni-channel-external-sidechain/1260/10 "2022-11-29T20:56:09Z")
Sounds like a fair solution, however how does one access the vst3 version of this plugin? Thanks