Soundtoys 5 combines all the audio effect plug-ins into. Soundtoys offers a robust solution for limitless multi-effect, it allows you to build custom effects chains characteristic of your own sound. So the only way you can get OBS stream with the overlay is to either use Screen Capture and get your whole screen, or (what I do) use a game capture to capture the game, then create a screen capture that is just the size of my overlay and then align the screen capture in OBS to match with the game capture. Soundtoys 5 is the ultimate audio effects solution that offering an extensive collection of classic studio plug-ins for modern digital music studio. OBS does support OpenGL for game capture mode and screen capture mode, but not window capture. You can see the same thing if you try to capture, for example, a Minecraft window in OBS. Now the issue with that is OBS does not support OpenGL windows. RainbowMage's OverlayPlugin uses Chromium Embedded Framework to render, so all Overlay Plugin's overlays are rendered with OpenGL. Click on the interrogation mark next to the url field, navigate to the OBS Overlay folder and select 'coordinator.html', then set the dimensions to your video dimensions (or less if you like pixels, more if you want supersampling). The dashboard that you will get here will give you the options to set all the parameters and if you are using an external mic.
The interface that you will get here is quite intuitive and user-friendly. I have tried a ton of different ways to try and make the clr browser. The CLR Browser Configuration window should appear. The open-source tool that you are getting will resolve the said issues but you will need to have some patience. Chromium is the rendering engine that Chrome uses. OBS & CLR Browser plugin wont show in source.
The issue is that chromium uses OpenGL to render the HTML.