Sidechain protocol multiple locations within the same plugin?

I know the Cubase allows for multiple-side chain sources, and I see that the Frequency plugin can do this with each source going to each band… Is this a special feature of being a Cubase factory plugin with additional protocols, or is this available to developers?

If it is a capability and developers aren’t doing it, then why? Is it just uninterest or is it because it’s too clunky to implement in their plugin? For example, Frequency plugin has a menu selection. But from what I see, there is no UI correlation/2-way communication between the plugin source select menu and what is in the side chain menu - ie, it’s completely dependent on the plugin to make the routing… which means developers would have to revise their plugin GUIs to have a menu system.

I was thinking of how this system could be implemented more easily without developers needing to change their plugin GUIs to include a side-chain source menu… Take Sonnox Dynamic EQ for example, If Cubase plugin Side-Chain enabled, and I enable external side-chain one or a few bands in Sonnox plugin - that should show up as its own sub-destination in the Cubase sends destination menu and also show up in the Cubase plugin-Side-Chain menu as a destination.

But this would obviously also require devs to update their plugins to feature this, but at least not require GUI changes.

I guess the summary is, Cubases plugin side-chain menu lacks destination UI communication to the plugin. Even if Sonnox were willing to revise their plugins background operation - there wouldn’t be a way to do this without having to redesign the plugins GUI.

Hi,
it’s absolutely possible for any VST 3 plug-in to support multiple side-chain input busses.
Please get in touch with the developers of the plug-ins you wish to have multiple side-chain inputs.

Also, please remember that this forum is specifically for developers using the VST 3 SDK, not for Cubase feature requests. If you have any Cubase-related questions or suggestions, please use the Cubase section of the forum.

Thanks!